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
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