After upgrading to Ubuntu 20.04 form 18.04, I wasn’t able to start GIMP 2.10. The message was in the same format as that in a related Ask Ubuntu question, except that the version numbers were greater.
I attempted installing the package
gegl, which was irrelavant to the problem.
I found the answers mentioning the package
$ dpkg -l | grep gegl ii gegl 0.4.22-3 amd64 Generic Graphics Library Test Program ii libgegl-0.4-0:amd64 1:0.4.18+om-0ubu18.04.18~ppa amd64 Generic Graphics Library ii libgegl-common 1:0.4.18+om-0ubu18.04.18~ppa all Generic Graphics Library - common files
Despite deletion of
ppa-purge, that leaves a
A related question on Ubuntu Francophone Forum contained the right command to solve the problem.
$ sudo apt-get install --reinstall libgegl-0.4-0=0.4.22-3 \ > libgegl-common=0.4.22-3 Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be DOWNGRADED: libgegl-0.4-0 libgegl-common 0 upgraded, 0 newly installed, 2 downgraded, 0 to remove and 0 not upgraded. Need to get 1,519 kB of archives. After this operation, 194 kB of additional disk space will be used. Do you want to continue? [Y/n] Y Get:1 http://archive.ubuntu.com/ubuntu focal/universe amd64 libgegl-0.4-0 amd64 0.4.22-3 [919 kB] Get:2 http://archive.ubuntu.com/ubuntu focal/universe amd64 libgegl-common all 0 .4.22-3 [599 kB] Fetched 1,519 kB in 3s (558 kB/s) dpkg: warning: downgrading libgegl-0.4-0:amd64 from 1:0.4.18+om-0ubu18.04.18~ppa to 0.4.22-3 (Reading database ... 228752 files and directories currently installed.) Preparing to unpack .../libgegl-0.4-0_0.4.22-3_amd64.deb ... Unpacking libgegl-0.4-0:amd64 (0.4.22-3) over (1:0.4.18+om-0ubu18.04.18~ppa) ... dpkg: warning: downgrading libgegl-common from 1:0.4.18+om-0ubu18.04.18~ppa to 0 .4.22-3 Preparing to unpack .../libgegl-common_0.4.22-3_all.deb ... Unpacking libgegl-common (0.4.22-3) over (1:0.4.18+om-0ubu18.04.18~ppa) ... Setting up libgegl-common (0.4.22-3) ... Setting up libgegl-0.4-0:amd64 (0.4.22-3) ... Processing triggers for libc-bin (2.31-0ubuntu9.1) ...