[Bug 1903212] [NEW] Error in upgrading to Ubuntu 20

[Stefano Musso]

Public bug reported:

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

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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

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