in /var/log/main.log
I found what may be the key point, but I dont know what to do next:
ERROR Dist-upgrade failed: 'E:Erreur, pkgProblem::Resolve a généré des 
ruptures, ce qui a pu être causé par les paquets devant être gardés en l'état.'

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https://bugs.launchpad.net/bugs/1890161

Title:
  Cannot upgrade from 18.04 to 20.04

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