[Bug 1903206] Re: Error in upgrading to Ubuntu 20

[Stefano Musso]

This is the last part of main.log:

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

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https://bugs.launchpad.net/bugs/1903206

Title:
  Error in upgrading to Ubuntu 20

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

Bug description:
  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'.

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