GIMP w'ont Start after Ubuntu Distro Upgrade


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 libgegl helpful.

$ 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:otto-kesselgulasch/gimp by ppa-purge, that leaves a trace in /etc/apt/sources.list.d.


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 focal/universe amd64 libgegl-0.4-0 amd64 
0.4.22-3 [919 kB]
Get:2 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
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) ...
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