[Qgis-user] How to install QGIS in Debian 11?

[Patrick Dunford]

Replying to both comments so far in this conversation.

All package managers to install the Qgis packages are dependent on the 
dependencies of these packages being available from their respective 
repositories. With an unstable distro this is more difficult as the 
packages in the distro repositories are constantly being updated and may 
not match the required ones at any particular point in time. As the 
message from the package manager says very clearly *"if you are using 
the unstable distribution that some required packages have not yet been 
created or been moved out of Incoming."*

Debian development editions are changing a lot more rapidly than the 
production editions which are noted for their stability so this is 
simply a fact of life using unstable or testing editions of Debian. 
There is always a risk with the unstable versions both of the distro and 
software that an update may break either and you may have to wait a few 
days until whichever unmet dependency is resolved but this may not 
actually happen until shortly after the next point release of Qgis 3.14 
is produced.

If you wanted to debug this further you could look at the lists of 
dependencies that are at this URL 
http://qgis.org/debian/dists/unstable/main/binary-amd64/Packages and 
then one possibility is to check all the dependencies of each package in 
turn. This is no doubt highly laborious considering the number of 
dependencies listed for the example libqgis-3d3.14.0 the first one in 
the list, and for all the others.

Using the nightly tree which is built more often therefore potentially 
more up to date is probably a better long term strategy. For example the 
current packages list at 
http://qgis.org/debian-nightly/dists/unstable/main/binary-amd64/Packages 
tells me there are later versions of some of the packages listed below 
present and they may be more likely to be up to date with the 
dependencies that are present in your computer.

There is one question I am unsure of however and that is whether 
unstable is for Ubuntu distros, and Debian users should be using the sid 
branch instead, or whether they are actually the same. sid is only 
available in debian-nightly tree however.

On 17/07/20 10:53 pm, aborruso wrote:
> Hi,
> I'm not able to install QGIS in Debian 11.
>
> My steps
>
> sudo add-apt-repository "deb     https://qgis.org/debian unstable main"
> sudo apt-get update
> sudo apt-get install qgis
>
> I have these errors:
>
> 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: libqgis-3d3.14.0 but it is not going to be installed
>          Depends: libqgis-analysis3.14.0 but it is not going to be installed
>          Depends: libqgis-app3.14.0 but it is not going to be installed
>          Depends: libqgis-core3.14.0 but it is not going to be installed
>          Depends: libqgis-gui3.14.0 but it is not going to be installed
>          Depends: libqt5core5a (>= 5.12.2) but 5.11.3+dfsg1-4 is to be
> installed
>          Depends: libqt5webkit5 (>= 5.212.0~alpha3) but it is not going to be
> installed
>          Depends: python3-qgis (= 1:3.14.0+99unstable-1) but it is not going
> to be installed
>          Depends: qgis-providers (= 1:3.14.0+99unstable-1) but it is not
> going to be installed
>          Recommends: qgis-plugin-grass but it is not going to be installed
> E: Unable to correct problems, you have held broken packages.
>
> How to solve these?
>
> Thank you
>
>
>
> --
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