[Qgis-user] QGIS uninstalled after GDAL PPA install

[J. M]

Hi Andre,

Okay thanks once again... I'll have a go, though I'm not sure how to remove
them. Would it be 'sudo apt-get remove gdal-bin' or does it need 'sudo
apt-get remove gdal-bin 3.0.2+dfsg-1~bionic2'? I ask because I don't know
if gdal-bin is something generic used elsewhere and I have to denominate
that. As I don't really understand what those files are, I'm wary of
removing them without being sure of the syntax first. Can I be sure they
aren't needed for another program, for example Blender?

So once those four files are removed I can try sudo apt-get install
libgdal20=2.2.3+dfsg-2 again? And once I have libgdal20 installed then I
can run sudo apt-get install qgis qgis-plugin-grass python3-qgis? If I'm
missing anything else then please let me know..

Cheers,
Jimi.

On Fri, Feb 28, 2020 at 7:27 PM Andre Joost <andre+joost at nurfuerspam.de>
wrote:

> Am 28.02.20 um 18:29 schrieb J. M:
>
> > Here's what I get:
> > sudo apt-get remove libgdal20
> > [sudo] password for jimi:
> > Reading package lists... Done
> > Building dependency tree
> > Reading state information... Done
> > Package 'libgdal20' is not installed, so not removed
>
> That was expected, because apt-cache policy libgdal20 already told you
> that it was not installed.
>
> > jimi at jimi-System-Product-Name:~$ dpkg -l | grep gdal
> > ii  gdal-bin                                   3.0.2+dfsg-1~bionic2
> >                      amd64        Geospatial Data Abstraction Library -
> > Utility programs
> > ii  gdal-data                                  3.0.2+dfsg-1~bionic2
> >                      all          Geospatial Data Abstraction Library -
> Data
> > files
> > ii  libgdal26                                  3.0.2+dfsg-1~bionic2
> >                      amd64        Geospatial Data Abstraction Library
> > ii  python3-gdal                               3.0.2+dfsg-1~bionic2
> >                      amd64        Python 3 bindings to the Geospatial
> Data
>
>
> These are still GDAL 3.02 packages that you installed with the ubuntugis
> PPA. Get rid of those, otherwise you will not get further.
>
> >
> > I'm still not clear about what the ubuntugis PPA is needed for, or what
> > gdal even is..
>
> GDAL is more or less the heartbeat of QGIS. Almost every operation uses
> it. For some reason, you must use exactly the same GDAL version as the
> QGIS package is compiled against. For bionic (without ubuntugis), this
> is GDAL 2.2.3. The gdal-abi package is used to confirm that version.
>
> With the Ubuntugis PPA, you have installed a newer version of GDAL
> (3.0.2), and the packet manager does not downgrade it by itself (it does
> not know about th specific QGIS requirements).
>
>
> HTH,
> Andre Joost
>
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