Hi, I have tried to upgrade to 20.04 with:
do-release-upgrade (No new release found.), and
sudo do-release-upgrade -c -d (New release '20.04' available. Run 'do-release-upgrade' to upgrade to it.) which frustrated me!
sudo do-release-upgrade -d seemed more likely, but after running it errored out as well (Could not determine the upgrade
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. )
The contents of the main.log file seemed to suggest that Ubuntu Mate packages were broken, but I do not know where to go from here. Any help or pointers would be appreciated (as a new user it won't let me post more than two links so I can only include the end of the log file. Even deleting all http references did not help):
2020-05-01 12:00:18,209 DEBUG running doUpdate() (showErrors=True)
2020-05-01 12:00:32,263 DEBUG openCache()
2020-05-01 12:00:32,555 DEBUG /openCache(), new cache size 64618
2020-05-01 12:00:32,555 DEBUG need_server_mode(): run in 'desktop' mode, (because of key deps for 'ubuntu-mate-core')
2020-05-01 12:00:33,210 ERROR Package net.downloadhelper.coapp has no priority set
2020-05-01 12:00:33,387 DEBUG Running KeepInstalledSection rules
2020-05-01 12:00:33,739 DEBUG Kernel uname: '5.3.0-51-generic'
2020-05-01 12:00:33,748 DEBUG nvidiaUpdate()
2020-05-01 12:00:34,250 INFO no old nvidia driver installed, installing no new
2020-05-01 12:00:34,250 DEBUG quirks: running PostDistUpgradeCache
2020-05-01 12:00:34,250 DEBUG running Quirks.PostDistUpgradeCache
2020-05-01 12:00:34,372 DEBUG Comparing 5.3.0-46 with
2020-05-01 12:00:34,372 DEBUG Comparing 5.3.0-51 with 5.3.0-46
2020-05-01 12:00:34,372 DEBUG Comparing 5.4.0-28 with 5.3.0-51
2020-05-01 12:00:34,430 INFO installing python-is-python2 because python-minimal was installed
2020-05-01 12:00:34,430 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
2020-05-01 12:00:34,453 DEBUG none of the '['ubuntu-desktop', 'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop', 'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-desktop', 'ubuntu-gnome-desktop', 'ubuntu-mate-core', 'ubuntu-mate-desktop', 'ubuntukylin-desktop', 'ubuntu-budgie-desktop']' meta-pkgs installed
2020-05-01 12:00:34,454 DEBUG guessing 'ubuntu-mate-core' as missing meta-pkg
2020-05-01 12:00:34,568 ERROR failed to mark 'ubuntu-mate-core' for install (E:Unable to correct problems, you have held broken packages.)
2020-05-01 12:00:34,809 ERROR Dist-upgrade failed: 'Broken packages after upgrade: ubuntu-mate-core'
2020-05-01 12:00:34,810 DEBUG abort called
2020-05-01 12:00:34,813 DEBUG openCache()
2020-05-01 12:00:36,462 DEBUG /openCache(), new cache size 90769