[T11 -> T12]
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Opening a specific thread for this: https://trisquel.info/en/forum/do-release-upgrade-stopped-lock-files#comment-183091
The upgrade from T11 to T12 in two machines stop with the following message:
The package 'trisquel-desktop-common' is marked for removal but it is in the removal deny list.
The command
$ [sudo] apt-mark showhold
returns nothing. This other one returns:
$ sudo apt-mark unhold trisquel-desktop-common trisquel-desktop-common was already not on hold.
(Sorry, I forgot to fulfill the rest of the thread's title. I cannot remove this one either.)
Making the question from #13 there here:
In a fresh T12 installation, trisquel-desktop-common is present. Why is the upgrade mechanism trying to remove it from T11?
https://trisquel.info/en/forum/do-release-upgrade-stopped-lock-files#comment-183091
Answering to your question in that post: yes, you can run build-ecne-upgrader.sh on https://gitlab.trisquel.org/trisquel/package-helpers/-/issues/245#3-current-version-of-the-script to generate the latest version of the upgrade script and execute it. I am not sure it will solve your problem though.
The package 'trisquel-desktop-common' is marked for removal but it is in the removal deny list.
That package and those that depend on it, such as trisquel-desktop-recommended or trisquel, are actually meta-packages: they do not install anything by themselves. If removing them helps you upgrade to Trisquel 12, I believe you can do so. Then, on Trisquel 12, executing tasksel in a terminal will allow you to setup your preferred desktop environment(s).
Taking the opportunity: Thank you for teaching me about tasksel.
Removing trisquel-desktop-common just worked, with the script from gitlab. In the end of the upgrade, during removals, dpkg failed; it fails again in T12 already before tasksel:
$ sudo apt autoremove REMOVING: trisquel-desktop-common-data Summary: Upgrading: 0, Installing: 0, Removing: 1, Not Upgrading: 1 1 not fully installed or removed. Freed space: 593 kB Continue? [Y/n] (Reading database ... 306780 files and directories currently installed.) Removing trisquel-desktop-common-data (11.0-4) ... Removing 'diversion of /etc/gtk-3.0/settings.ini to /etc/gtk-3.0/settings.ini.ubuntu by trisquel-desktop-common-data' dpkg-divert: error: rename involves overwriting '/etc/gtk-3.0/settings.ini' with different file '/etc/gtk-3.0/settings.ini.ubuntu', not allowed dpkg: error processing package trisquel-desktop-common-data (--remove): installed trisquel-desktop-common-data package post-removal script subprocess returned error exit status 2 dpkg: too many errors, stopping Errors were encountered while processing: trisquel-desktop-common-data Processing was halted because there were too many errors. Error: Sub-process /usr/bin/dpkg returned an error code (1)
Besides that, there was only two apparent glitches. One of them was dpkg complaining about not having fontconfig-config installed before installing noto fonts; fontconfig-config was installed just after that. The second was dpkg complaining about: break-usrmerge (dpkg does not work with mere links for usrmerge, according to that message).