subject:"\[Bug 1902992\] \[NEW\] upgrade from 18.04 to 20.04 stops midway\"An unresolvable problem occurred while calculating the upgrade. This was likely caused by\: \* Unofficial software packages not provided by Ubuntu Please use the tool 'ppa\-purge' from the ppa\-purge package to remove software from a Launchpad PPA and try the upgrade again.\""

No matches were found for subject:"\[Bug 1902992\] \[NEW\] upgrade from 18.04 to 20.04 stops midway\"An unresolvable problem occurred while calculating the upgrade. This was likely caused by\: \* Unofficial software packages not provided by Ubuntu Please use the tool 'ppa\-purge' from the ppa\-purge package to remove software from a Launchpad PPA and try the upgrade again.\""