[Qgis-user] QGIS uninstalled after GDAL PPA install

J. M jimimckay at gmail.com
Thu Feb 27 14:57:36 PST 2020 

Hi there guys,

I think I've done everything that people have suggested, including Andre's
last suggestion:
sudo apt-get install libgdal20=2.2.3+dfsg-2, which returned this, similar
to last time:

sudo apt-get install libgdal20=2.2.3+dfsg-2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 libgdal20 : Depends: libogdi3.2 (>= 3.2.0) but it is not going to be
installed
E: Unable to correct problems, you have held broken packages.

As I can't get beyond that point I have no idea what else to try, to be
honest. As Ben suggested I edited the etc file to include this:
deb https://qgis.org/ubuntu-ltr bionic main, because Ubuntu 18.04 LTS
doesn't yet support QGIS 3.12. If you can install QGIS and run it, then how
do you simply remove the entire program and all its dependencies so that
you can start from scratch? If I run purge X on any other program I think
my system removes it completely, though I'm not sure.

Fernando Moxo suggested the following, but I've already run sudo apt-get
autoremove qgis (as QGIS wasn't the last program I installed and I don't
want this process to randomly erase vital dependencies and leave me with
half an OS) and there are fewer unmet dependencies now than the first time,
but I don't know what 'installed prereq.' means, or 'Id those prereq'.
Sorry, I can't act on that line because I don't understand it.

sudo apt autoremove

Should uninstall all dangling installed prereq.   Id those prereq are
being kept due to some other package requiring them, or some remaining
from previous Qgis install it can take a bit more effort to fix.


I don't know how to erase individual dependencies, so without specific
commands I wouldn't know where to start. I ran autoremove and I thought it
took out everything, even dependencies unrelated to QGIS. Out of curiosity,
are the majority of QGIS users software developers as well? I've never
experienced this level of technical difficulty associated with the
installation of a piece of software on Linux before (I've been a dedicated
Ubuntu user since 12.04 LTS).

Could someone recommend where to start from scratch, and suggest what to do
step-by-step, so I'm not cluttering up the group email with the same
queries for ages? I had it working perfectly (albeit briefly) before I
accidentally installed the ubuntugis-unstable PPA, so I know it's not a
problem with my OS.
Many thanks again,
Jimi.



On Thu, Feb 27, 2020 at 1:10 PM Fernando M. Roxo da Motta <petro at roxo.org>
wrote:

> On Wed, 26 Feb 2020 12:33:24 +0800, Ben Hur Pintor <bnhr.dev at gmail.com>
> wrote:
>
>
> > Hi!
> >
> > It looks like your machine is trying to install 3.12.
>
>   This kind of error usually indicates that 3.12 is already
> installed.  Prossibly a previous install brought in the 3.12 version as
> a pre-requirement.   If that is so, a command like:
>
> $ sudo apt autoremove
>
> Should uninstall all dangling installed prereq.   Id those prereq are
> being kept due to some other package requiring them, or some remaining
> from previous Qgis install it can take a bit more effort to fix.
>
>   Try to remove directly each of those dependencies.
>
>
>   HTH
>
> >
> > As I mentioned in the last part of my previous message, right now you
> > can't install QGIS 3.12 on Ubuntu 18.04 because 3.12 needs PROJ 6.3.1
> > which currently isn't available in Bionic -- via the main canonical
> > repo or even with the ubuntugis-unstable PPA. Therefore, I suggest
> > installing from the LTR branch and not the LR branch. When I use the
> > LTR branch with ubuntugis dependencies, I get QGIS 3 10.2 no problem.
> >
> > I run the same machine as you and actually faced the same problem
> > when I tried to install the Latest Release (3.12) on Bionic. Try
> > using the repos for the LTR (the ones with -ltr in the end). Maybe
> > that will help.
> >
> > Don't worry about it, we've all been there.
> >
> >
> > All the best,
> > Ben Hur
> >
> > On Wed, Feb 26, 2020, 07:12 J. M <jimimckay at gmail.com> wrote:
> >
> > > Hi Ben,
> > >
> > > No joy, I'm afraid. I think I did everything you recommended. I'm
> > > going to run through it in case I missed something obvious:
> > >
> > >    - I ran sudo apt remove qgis grass qgis-plugin-grass, then ran
> > > sudo apt-get update
> > >    - The /etc/apt/sources file contains the correct info because I
> > >    modified it for the last installation
> > >    - I ran autoremove on QGIS and erased over a gigabyte of
> > >    dependencies (which seemed like a *lot*..)
> > >    - I ran sudo apt-key list to check if the ubuntugis-unstable PPA
> > > was still listed as trusted, and it didn't appear
> > >    - I added the ubuntugis stable PPA as recommended on
> > >    https://trac.osgeo.org/ubuntugis/wiki/UbuntuGISRepository, with
> > > sudo add-apt-repository ppa:ubuntugis/ppa, and it appeared to
> > > duplicate your command sudo apt-key adv --keyserver
> > > keyserver.ubuntu.com --recv-key 51F523511C7028C3. Is that possible
> > > when they appear to reference two different PPA's?
> > >    - I ran sudo apt-get install qgis qgis-plugin-grass and received
> > > the following error message, similar to before:
> > >
> > > The following packages have unmet dependencies.
> > >  qgis : Depends: gdal-abi-2-2-3
> > >         Depends: libqgis-analysis3.12.0 but it is not going to be
> > > installed Depends: libqgis-app3.12.0 but it is not going to be
> > > installed Depends: libqgis-core3.12.0 but it is not going to be
> > > installed Depends: libqgis-gui3.12.0 but it is not going to be
> > > installed Depends: python3-qgis (= 1:3.12.0+28bionic) but it is not
> > > going to be installed
> > >         Depends: qgis-providers (= 1:3.12.0+28bionic) but it is not
> > > going to be installed
> > >  qgis-plugin-grass : Depends: qgis-provider-grass (=
> > > 1:3.12.0+28bionic) but it is not going to be installed
> > >                      Depends: grass740
> > >                      Depends: libqgis-app3.12.0 but it is not going
> > > to be installed
> > >                      Depends: libqgis-core3.12.0 but it is not
> > > going to be installed
> > >                      Depends: libqgis-gui3.12.0 but it is not going
> > > to be installed
> > >                      Depends: libqgisgrass7-3.12.0 but it is not
> > > going to be installed
> > > E: Unable to correct problems, you have held broken packages.
> > >
> > > I must be missing something. Do I have to open the UI via terminal
> > > (sudo nautilus) and manually remove every file which makes
> > > reference to QGIS and ubuntugis-unstable? As formatting my machine
> > > isn't an option there must be a simple way of completely removing
> > > the program and its dependencies.. right?!
> > >
> > > I don't even know what Gdal is or does, because I can't even get
> > > started learning QGIS because I'm finding it impossible to have a
> > > version running for long enough to start with tutorials! Is it to
> > > allow you to overlay raster info onto GIS projects or something? I
> > > googled it but the explanation must have been written by a robot
> > > (no offence intended, to robots I mean). Gdal was the reason I
> > > installed the ubuntugis-unstable PPA, because Blender gave me the
> > > helpful error message: Please install gdal to enable raster
> > > projection support. As my crystal ball was clouded up when I read
> > > that I came here to bug you guys for help!
> > >
> > >
> > > Thanks again to everyone who has had a go at helping me. Keep those
> > > ideas coming!!
> > > Cheers,
> > > Jimi.
> > >
> > > On Tue, Feb 25, 2020 at 11:39 PM J. M <jimimckay at gmail.com> wrote:
> > >
> > >> Hi Ben!
> > >>
> > >> Thanks a lot for that, really helpful; I'll give it a go. It was
> > >> actually the ubuntugis unstable PPA which caused the current
> > >> problem I'm having, so I'm keen to avoid that PPA if I can. I'll
> > >> try your steps again and let you know what the outcome is.
> > >>
> > >> Cheers,
> > >> Jimi.
> > >>
> > >> On Tue, Feb 25, 2020 at 4:44 AM Ben Hur Pintor <bnhr.dev at gmail.com>
> > >> wrote:
> > >>
> > >>> Hi!
> > >>>
> > >>> First of all, make sure that you add the qgis.org repo public key
> > >>> via sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key
> > >>> 51F523511C7028C3. Make sure that the library versions in your
> > >>> computer (specially GDAL and PROJ) are the same libraries that
> > >>> QGIS is built against.
> > >>>
> > >>> The links in
> > >>>
> https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu
> > >>> determine which versions of QGIS will be installed. You add these
> > >>> as sources in the Software Center or you can add them directly in
> > >>> your /etc/apt/sources.list file as instructed in
> > >>> https://qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu.
> > >>> If you want 3.12 (Latest Release), you can use/add the following
> > >>> in your /etc/apt/sources.list file https://qgis.org/ubuntu or
> > >>> https://qgis.org/ubuntugis (if with ubuntugis-unstable
> > >>> dependencies). If you want the LTR branch (3.10.3), simply use
> > >>> https://qgis.org/ubuntu-ltr or https://qgis.org/ubuntugis-ltr (if
> > >>> with ubuntugis-unstable dependencies) in
> > >>> your /etc/apt/sources.list file.
> > >>>
> > >>> Also, don't forget to remove/purge all previous QGIS or GRASS
> > >>> installations (e.g. sudo apt remove qgis grass qgis-plugin-grass)
> > >>> and do an update (sudo apt update) before trying to install QGIS
> > >>> again.
> > >>>
> > >>> I run Pop! OS 18.04 (based on Ubuntu 18.04). Unfortunately, the
> > >>> libraries in the main (universe) repo of Bionic are a bit
> > >>> outdated (GDAL 2.2.3, PROJ 4.9, etc.). The newer versions of QGIS
> > >>> use GDAL 3.0.X and PROJ 6.X. Using the ubuntugis-unstable (
> > >>> https://launchpad.net/~ubuntugis/+archive/ubuntu/ubuntugis-unstable)
> > >>> PPA remedies the problem of some outdated libraries. If you will
> > >>> use the ubuntugis-unstable libraries, don't forget to add the PPA
> > >>> to your sources as well. On another note, PROJ 6.3.1, which QGIS
> > >>> 3.10.3 and 3.12 use, isn't available yet in Bionic even when
> > >>> using the ubuntugis PPA so even if I want, I can only install
> > >>> 3.10.2 right now on my machine. Trying to install 3.12 via the
> > >>> ubuntu or ubuntugis repo fails.
> > >>>
> > >>>
> > >>> All the best,
> > >>> Ben Hur
> > >>>
> > >>> On Tue, Feb 25, 2020, 07:25 J. M <jimimckay at gmail.com> wrote:
> > >>>
> > >>>> Hi Ismail,
> > >>>>
> > >>>> Well, I've tried everything I can think of, everything people
> > >>>> have recommended and everything I've googled, but there seems to
> > >>>> be no earthly way to get rid of the following error messages:
> > >>>>
> > >>>> sudo apt-get install qgis qgis-plugin-grass
> > >>>> Reading package lists... Done
> > >>>> Building dependency tree
> > >>>> Reading state information... Done
> > >>>> Some packages could not be installed. This may mean that you have
> > >>>> requested an impossible situation or if you are using the
> > >>>> unstable distribution that some required packages have not yet
> > >>>> been created or been moved out of Incoming.
> > >>>> The following information may help to resolve the situation:
> > >>>>
> > >>>> The following packages have unmet dependencies.
> > >>>>  qgis : Depends: python3-qgis (= 1:3.12.0+28bionic) but it is
> > >>>> not going to be installed
> > >>>> E: Unable to correct problems, you have held broken packages.
> > >>>>
> > >>>> I've tried this:
> > >>>>
> > >>>> sudo apt-get purge qgis
> > >>>> sudo apt-get autoremove qgis
> > >>>> sudo apt-get --purge remove qgis
> > >>>> sudo apt-get update
> > >>>>
> > >>>>  but it returned the following:
> > >>>>
> > >>>> sudo apt-get update
> > >>>>
> > >>>>
> > >>>> Hit:6 http://qgis.org/debian bionic InRelease
> > >>>>
> > >>>>   The following signatures couldn't be verified because the
> > >>>> public key is not available: NO_PUBKEY 76F1A20FF987672F
> > >>>> Hit:18
> > >>>> http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu
> > >>>> bionic InRelease Err:18
> > >>>> http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu
> > >>>> bionic InRelease The following signatures couldn't be verified
> > >>>> because the public key is not available: NO_PUBKEY
> > >>>> 089EBE08314DF160 Reading package lists... Done
> > >>>> W: GPG error: https://dl.winehq.org/wine-builds/ubuntu bionic
> > >>>> InRelease: The following signatures couldn't be verified because
> > >>>> the public key is not available: NO_PUBKEY 76F1A20FF987672F
> > >>>> E: The repository 'https://dl.winehq.org/wine-builds/ubuntu
> > >>>> bionic InRelease' is not signed.
> > >>>> N: Updating from such a repository can't be done securely, and is
> > >>>> therefore disabled by default.
> > >>>> N: See apt-secure(8) manpage for repository creation and user
> > >>>> configuration details.
> > >>>> W: An error occurred during the signature verification. The
> > >>>> repository is not updated and the previous index files will be
> > >>>> used. GPG error:
> > >>>> http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu
> > >>>> bionic InRelease: The following signatures couldn't be verified
> > >>>> because the public key is not available: NO_PUBKEY
> > >>>> 089EBE08314DF160
> > >>>>
> > >>>>
> > >>>> I can't think of anything else. Any suggestions about what I
> > >>>> might be doing wrong? I don't actually understand what this link
> > >>>> is for:
> > >>>>
> https://www.qgis.org/en/site/forusers/alldownloads.html#debian-ubuntu
> > >>>> If you download via the terminal by typing 'sudo apt-get install
> > >>>> qgis' then how do you make use of all the folders in this link?
> > >>>> I mean, how do I differentiate if I want to download version
> > >>>> 3.10 or 3.12 of QGIS?
> > >>>>
> > >>>> Sorry team, I just can't get this to work and I'm worried I do
> > >>>> irreparable damage to my system with this process.
> > >>>> Please help me out, guys!
> > >>>> Cheers,
> > >>>> Jimi.
> > >>>>
> > >>>>
> > >>>>
> > >>>> On Mon, Feb 24, 2020 at 6:58 PM J. M <jimimckay at gmail.com> wrote:
> > >>>>
> > >>>>> Hi Ismail!
> > >>>>>
> > >>>>> Many thanks for your advice; I'll check it out. I haven't
> > >>>>> actually had a chance to sit down and try to purge QGIS and
> > >>>>> start again. Andre was trying to help me but I wasn't sure
> > >>>>> where to start so I haven't tried since I last inquired about
> > >>>>> the process!
> > >>>>>
> > >>>>> Thanks a lot,
> > >>>>> Jimi.
> > >>>>>
> > >>>>> On Sun, Feb 23, 2020 at 8:59 AM Ismail Sunni
> > >>>>> <imajimatika at gmail.com> wrote:
> > >>>>>
> > >>>>>> Hi Jimi,
> > >>>>>>
> > >>>>>> I have a similar problem. I fix it by reinstalling gdal
> > >>>>>> (libgdal20). I can install QGIS again after that. But, I am
> > >>>>>> not an expert with this package manager thing, so perhaps it
> > >>>>>> can work for you also, or perhaps not :)
> > >>>>>>
> > >>>>>> While trying to fix my problem, I found this
> > >>>>>>
> https://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa
> > >>>>>> which probably useful for you.
> > >>>>>>
> > >>>>>> Best regards
> > >>>>>>
> > >>>>>> On Thu, Feb 20, 2020 at 1:22 PM J. M <jimimckay at gmail.com>
> > >>>>>> wrote:
> > >>>>>>> Hi again Andre,
> > >>>>>>>
> > >>>>>>> Thanks for that, I more or less get what you mean. The
> > >>>>>>> problem is that when I ran autoremove it came back with
> > >>>>>>> almost a gig of dependencies it wanted to remove, so I
> > >>>>>>> cancelled it! QGIS wasn't the last program I installed so I
> > >>>>>>> have no idea how to purge only the dependencies directly
> > >>>>>>> related to the previous version of it I was running. If I run
> > >>>>>>> autoremove and it damages other applications or makes my
> > >>>>>>> system unusable then I won't be able to fix it (I'm only a
> > >>>>>>> user, I've got no background in programming). I read around
> > >>>>>>> and people warned strongly against doing this unless you're
> > >>>>>>> sure what you want to remove. How can I be sure I only remove
> > >>>>>>> the right dependencies? Does QGIS have a list or something I
> > >>>>>>> can use as a guide?
> > >>>>>>>
> > >>>>>>> If anyone could explain how to use Synaptic package manager
> > >>>>>>> then I'd be really grateful! It must have the most
> > >>>>>>> unintuitive interface of any piece of software I've ever
> > >>>>>>> tried to use..
> > >>>>>>>
> > >>>>>>> I edited the source file last time I installed it, so that
> > >>>>>>> part is done. Incidentally, I don't see the 'other Software'
> > >>>>>>> tab in the Ubuntu Software Center, so I just edited it
> > >>>>>>> manually. Any idea what that package is called? I'm happy
> > >>>>>>> enough using the terminal if I know (roughly) what I'm doing!
> > >>>>>>>
> > >>>>>>> Thanks a lot team,
> > >>>>>>> Jimi.
> > >>>>>>>
> > >>>>>>> On Wed, Feb 19, 2020 at 8:18 PM Andre Joost <
> > >>>>>>> andre+joost at nurfuerspam.de> wrote:
> > >>>>>>>
> > >>>>>>>> Am 18.02.20 um 23:58 schrieb J. M:
> > >>>>>>>> > Hi again Andre,
> > >>>>>>>> >
> > >>>>>>>> > I don't actually understand what to do with this, because
> > >>>>>>>> > I can't
> > >>>>>>>> run 'sudo
> > >>>>>>>> > apt-get install qgis qgis-plugin-grass' as it keeps giving
> > >>>>>>>> > me the
> > >>>>>>>> same
> > >>>>>>>> > error messages about broken packages.
> > >>>>>>>>
> > >>>>>>>> Yes, because you have packages that are compiled against a
> > >>>>>>>> set of libraries that does not match your computer. You have
> > >>>>>>>> to remove, autoremove and purge those QGIS packages to force
> > >>>>>>>> a download from the
> > >>>>>>>> right folder.
> > >>>>>>>>
> > >>>>>>>>
> > >>>>>>>> > When you say this, I don't get what this link does. I
> > >>>>>>>> > click on it
> > >>>>>>>> and it
> > >>>>>>>> > just takes me into a file hierarchy. Are users supposed to
> > >>>>>>>> > obtain
> > >>>>>>>> the
> > >>>>>>>> > downloads from here, or is it purely informative?
> > >>>>>>>> > Try
> > >>>>>>>> > deb https://qgis.org/ubuntugis bionic main
> > >>>>>>>>
> > >>>>>>>> That should go into your sources list, to replace the QGIS
> > >>>>>>>> download source you used before. The Ubuntu Software center
> > >>>>>>>> has a tab for "other
> > >>>>>>>> Software" that holds the same information, so no need to
> > >>>>>>>> edit the sources file manually.
> > >>>>>>>>
> > >>>>>>>> HTH,
> > >>>>>>>> Andre Joost
> > >>>>>>>>
> > >>>>>>>>
> > >>>>>>>> _______________________________________________
> > >>>>>>>> Qgis-user mailing list
> > >>>>>>>> Qgis-user at lists.osgeo.org
> > >>>>>>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > >>>>>>>> Unsubscribe:
> > >>>>>>>> https://lists.osgeo.org/mailman/listinfo/qgis-user
> > >>>>>>>
> > >>>>>>> _______________________________________________
> > >>>>>>> Qgis-user mailing list
> > >>>>>>> Qgis-user at lists.osgeo.org
> > >>>>>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > >>>>>>> Unsubscribe:
> > >>>>>>> https://lists.osgeo.org/mailman/listinfo/qgis-user
> > >>>>>>
> > >>>>>>
> > >>>>>>
> > >>>>>> --
> > >>>>>> Ismail Sunni
> > >>>>>> Software Engineer
> > >>>>>> ismailsunni.id
> > >>>>>> ismailsunni.wordpress.com
> > >>>>>>
> > >>>>> _______________________________________________
> > >>>> Qgis-user mailing list
> > >>>> Qgis-user at lists.osgeo.org
> > >>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > >>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > >>>
> > >>>
>
>
>
>
>
>
>
>
>   Roxo
>
> --
> ---------------- Non luctari, ludare -------------------+ WYSIWYG
> Fernando M. Roxo da Motta <petro at roxo.org>              | Editor?
> Except where explicitly stated I speak on my own behalf.|  VI !!
>                 PU5RXO                                  | I see text,
> ------------ Quis custodiet ipsos custodes?-------------+ I get text!
>
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