[Bug 1928441] Re: Fail in upgrade to 21.04

[chantal]

/var/log/dist-upgrade/apt.log file :
https://drop.infini.fr/r/C7X0J6JTqr#Iy6UBAya4aJ4GOX/k3xszribWC3dS7LrQZOa4MKlN9Q=

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https://bugs.launchpad.net/bugs/1928441

Title:
  Fail in upgrade to 21.04

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  can't upgrade to 21.0
  get the message : 
  "An unresolvable problem occurred while calculating the upgrade.

   If none of this applies, then please report this bug using the
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
  you want to investigate this yourself the log files in '/var/log/dist-
  upgrade' will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'."

  Here main.log file  : https://drop.chapril.org/download/d15a3cd196d96a89/#CYJTk1SqlvRjG4fbY0-BWw (expires after 5 days)
  Here apt.log file : https://drop.chapril.org/download/b7f475dce91d38d9/#C9r_ueZLtQdavrvdbvykHA
  (expires after 5 days)

  Thank for your help !

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubuntu-release-upgrader-core 1:20.10.15
  ProcVersionSignature: Ubuntu 5.8.0-53.60-generic 5.8.18
  Uname: Linux 5.8.0-53-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri May 14 09:53:19 2021
  InstallationDate: Installed on 2021-02-03 (99 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to groovy on 2021-05-14 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2021-05-14 09:51:30.696117
   Log time: 2021-05-14 09:51:36.462482
  VarLogDistupgradeTermlog:

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