I hit the same problem on recent update.
In my case I was using qgis.org/ubuntugis with the ubuntugis-unstable
There appears to be an incompatibility between the two right now. This isn't the first time, and it could be related to recent updates 2021-12-24, will likely be solved if the qgis.org packages are rebuilt now that some new deps in ubuntugis have been updated (Is it Jurgen who still manages that?). Until then I just disabled qgis.org repo and reinstalled and have an older version working for now.

Thanks,
Alex

On 1/10/22 10:28 AM, Martin Weis wrote:
Hello Jorge!

Am 10.01.22 um 13:43 schrieb Jorge Gustavo Rocha:
It seems to happens when some QGIS tool runs.
My wild guess is to check if you are not running QGIS against some old
PROJ or GDAL version. Check if you have some dangling PROJ or GDAL libs
around.
Found an issue from 2020 about it
https://github.com/qgis/QGIS/issues/35649

and your guess seems the correct direction, but I cannot solve by
starting fresh with

apt remove libgdal29 libgdal30
cat<< EOF> /etc/apt/sources.list.d/qgis-ubuntugis-unstable.list
deb https://qgis.org/ubuntugis $(lsb_release -s -c) main
deb-src https://qgis.org/ubuntugis $(lsb_release -s -c) main
EOF

# lsb_release -s -c # focal

yielding

root@box:/etc/apt# rgrep qgis *
sources.list.d/qgis-ubuntugis-unstable.list:deb
https://qgis.org/ubuntugis focal main
sources.list.d/qgis-ubuntugis-unstable.list:deb-src
https://qgis.org/ubuntugis focal main
Binary file trusted.gpg matches
Binary file trusted.gpg.d/qgis-archive.gpg matches


there are dependencies to both lbgdal29 and libgdal30 from qgis

apt install qgis
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
   gdal-bin grass-core libgdal29 libgdal30 libpdal-base12
libpdal-plugin-e57 libpdal-plugin-faux libpdal-plugin-hdf libpdal-plugin-i3s
   libpdal-plugin-icebridge libpdal-plugin-pgpointcloud libpdal-plugins
libqgis-3d3.22.2 libqgis-analysis3.22.2 libqgis-app3.22.2 libqgis-core3.22.2
   libqgis-customwidgets libqgis-gui3.22.2 libqgis-server3.22.2
libqgisgrass7-3.22.2 libqgispython3.22.2 python3-gdal python3-qgis
python3-qgis-common
   qgis-plugin-grass qgis-provider-grass qgis-providers
Suggested packages:
   libgdal-grass grass-dev grass-gui e00compr avce00 gnuplot gpsbabel
gpstrans python3-rpy2 python3-termcolor otb-qgis saga
The following NEW packages will be installed:
   gdal-bin grass-core libgdal29 libgdal30 libpdal-base12
libpdal-plugin-e57 libpdal-plugin-faux libpdal-plugin-hdf libpdal-plugin-i3s
   libpdal-plugin-icebridge libpdal-plugin-pgpointcloud libpdal-plugins
libqgis-3d3.22.2 libqgis-analysis3.22.2 libqgis-app3.22.2 libqgis-core3.22.2
   libqgis-customwidgets libqgis-gui3.22.2 libqgis-server3.22.2
libqgisgrass7-3.22.2 libqgispython3.22.2 python3-gdal python3-qgis
python3-qgis-common
   qgis qgis-plugin-grass qgis-provider-grass qgis-providers

I guess because of rdepends of python3-gdal

apt show python3-gdal
Version: 3.4.0+dfsg-1~focal0
Maintainer: Debian GIS Project <pkg-grass-de...@lists.alioth.debian.org>
Depends: python3 (<< 3.9), python3 (>= 3.8~), python3-numpy (>=
1:1.16.0~rc1), python3-numpy-abi9, python3:any, libc6 (>= 2.14),
libgcc-s1 (>= 3.0), libgdal30 (>= 3.4.0), libstdc++6 (>= 5.2)
which is also from unstable ubuntugis:

apt-cache policy python3-gdal
python3-gdal:
   Installed: (none)
   Candidate: 3.4.0+dfsg-1~focal0
   Version table:
      3.4.0+dfsg-1~focal0 500
         500
http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu focal/main
amd64 Packages

So I will try to switch to ltr for now, but this seems to be a
dependency problem in the repo.

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