[Qgis-user] Installing QGIS- 3.4.x Madeira LTR for Ubuntu xenial

[Andre Joost]

Am 20.11.19 um 11:13 schrieb Mike Flannigan:
>
> I have your exact same problem, except I tried to
> install QGIS 3.10 after uninstalling my QGIS 2.18.
> I am on Linux Mint 19.2.
>
> When I go to the directory: /usr/share/gdal
> I have a folder "2.2"
>
> My sources.list file located here:
> /etc/apt/sources.list
> has this inside it:
>
> #deb cdrom:[Linux Mint 19.2 _Tina_ - Release amd64 20190729]/ bionic
> contrib main non-free
> deb https://qgis.org/ubuntu/ unstable main
> deb-src https://qgis.org/ubuntu/ unstable main
>
>
> The output of the 2 install commands is shown below.
>
> The problem is that I try to install QGIS 3.10 and I
> wind up with QGIS 2.18.
>

The problem is that you have not added the QGIS key to your keyring. 
Hence the whole qgis.org repo is left out, and you get QGIS2 from the 
main Ubuntu repo.

Try
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-key 
51F523511C7028C3

in one line, and it should work.

HTH,
Andre Joost