I think this is the relevant portion of the log.
There was a post which might be related to this problem but for me there was no conclusive solution.
When updating the system via younohost or apt there are no errors.
Please let me know how to proceede from here.
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2022-12-03 23:19:49,025: INFO - + Removing build-essential (12.6) …
2022-12-03 23:19:56,184: DEBUG - Running: LC_ALL=C DEBIAN_FRONTEND=noninteractive APT_LISTCHANGES_FRONTEND=none apt install --quiet -o=Dpkg::Use-Pty=0 --fix-broken --assume-yes gcc-8- libgcc-8-dev- equivs
2022-12-03 23:19:56,207: DEBUG -
2022-12-03 23:19:56,208: WARNING - WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
2022-12-03 23:19:56,210: DEBUG -
2022-12-03 23:19:56,278: INFO - + Reading package lists…
2022-12-03 23:19:56,830: INFO - + Building dependency tree…
2022-12-03 23:19:56,834: INFO - + Reading state information…
2022-12-03 23:19:57,681: INFO - + Some packages could not be installed. This may mean that you have
2022-12-03 23:19:57,682: INFO - + requested an impossible situation or if you are using the unstable
2022-12-03 23:19:57,684: INFO - + distribution that some required packages have not yet been created
2022-12-03 23:19:57,685: INFO - + or been moved out of Incoming.
2022-12-03 23:19:57,687: INFO - + The following information may help to resolve the situation:
2022-12-03 23:19:57,688: DEBUG -
2022-12-03 23:19:57,689: INFO - + The following packages have unmet dependencies:
2022-12-03 23:19:58,117: INFO - + equivs : Depends: debhelper but it is not going to be installed
2022-12-03 23:19:58,119: INFO - + libgirepository-1.0-1 : Breaks: python3-gi (< 3.34.0-4~) but 3.30.4-1 is to be installed
2022-12-03 23:19:58,124: INFO - + yunohost : Depends: php7.3-fpm but it is not going to be installed
2022-12-03 23:19:58,127: INFO - + Depends: php7.3-intl but it is not going to be installed
2022-12-03 23:19:58,129: INFO - + Depends: mailutils but it is not going to be installed
2022-12-03 23:19:58,189: WARNING - E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
2022-12-03 23:19:59,192: INFO - Starte Hauptupdate…
2022-12-03 23:21:52,354: INFO - Pakete werden aktualisiert…
2022-12-03 23:21:52,374: INFO - Momentan werden Upgrades für das System (YunoHost-unabhängige) Pakete durchgeführt…
2022-12-03 23:21:52,862: DEBUG - Running apt command :
DEBIAN_FRONTEND=noninteractive APT_LISTCHANGES_FRONTEND=none apt-get --fix-broken --show-upgraded --assume-yes --quiet -o=Dpkg::Use-Pty=0 -o Dpkg::Options::=“–force-confold” -o Dpkg::Options::=“–force-confmiss” -o Dpkg::Options::=“–force-confdef” dist-upgrade
2022-12-03 23:21:52,955: INFO - + Paketlisten werden gelesen…
2022-12-03 23:21:53,533: INFO - + Abhängigkeitsbaum wird aufgebaut…
2022-12-03 23:21:53,537: INFO - + Statusinformationen werden eingelesen…
2022-12-03 23:21:54,572: INFO - + Paketaktualisierung (Upgrade) wird berechnet…
2022-12-03 23:21:54,574: INFO - + Einige Pakete konnten nicht installiert werden. Das kann bedeuten, dass
2022-12-03 23:21:54,575: INFO - + Sie eine unmögliche Situation angefordert haben oder, wenn Sie die
2022-12-03 23:21:54,576: INFO - + Unstable-Distribution verwenden, dass einige erforderliche Pakete noch
2022-12-03 23:21:54,578: INFO - + nicht erstellt wurden oder Incoming noch nicht verlassen haben.
2022-12-03 23:21:54,579: INFO - + Die folgenden Informationen helfen Ihnen vielleicht, die Situation zu lösen:
2022-12-03 23:21:54,580: DEBUG -
2022-12-03 23:21:54,581: INFO - + Die folgenden Pakete haben unerfüllte Abhängigkeiten:
2022-12-03 23:21:55,021: INFO - + libc6-dev : Beschädigt: libgcc-8-dev (< 8.4.0-2~) aber 8.3.0-6+rpi1 soll installiert werden
2022-12-03 23:21:55,079: WARNING - E: Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.