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@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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