[Bug 1903212] ProcEnviron.txt

[Stefano Musso]

apport information

** Attachment added: "ProcEnviron.txt"
   https://bugs.launchpad.net/bugs/1903212/+attachment/5431786/+files/ProcEnviron.txt

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https://bugs.launchpad.net/bugs/1903212

Title:
  Error in upgrading to Ubuntu 20

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

Bug description:
  I have these error in upgrading from 18 to 20:

  An unresolvable problem occurred while calculating the upgrade.

  This was caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  This is most likely a transient problem, 
  please try again later. 

  in Main.log I have this error:

  2020-11-05 22:10:12,844 DEBUG quirks: running PreDistUpgradeCache
  2020-11-05 22:10:12,844 DEBUG running Quirks.PreDistUpgradeCache
  2020-11-05 22:10:12,844 INFO checking for python-dbg
  2020-11-05 22:10:12,844 INFO installing python2-dbg because python-dbg was installed
  2020-11-05 22:10:12,844 DEBUG Installing 'python2-dbg' (python-dbg was installed on the system)
  2020-11-05 22:10:13,143 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'
  2020-11-05 22:10:13,145 DEBUG abort called
  2020-11-05 22:10:13,147 DEBUG openCache()
  2020-11-05 22:10:17,895 DEBUG Comparing 5.4.0-51 with 
  2020-11-05 22:10:17,896 DEBUG Comparing 5.4.0-52 with 5.4.0-51
  2020-11-05 22:10:18,367 DEBUG /openCache(), new cache size 100218
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2019-03-12 (604 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  Package: ubuntu-release-upgrader (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-generic 5.4.65
  Tags:  bionic dist-upgrade
  Uname: Linux 5.4.0-52-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2020-11-05 (0 days ago)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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