[Bug 1820547] Re: 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

As before you upgrade Ubuntu ,you have to remove unnecessary and corrupted packages . I have resolved issue by following commands: apt list --upgradable sudo apt autoremove sudo do-release-upgrade -h sudo do-release-upgrade -d -f DistUpgradeViewGtk3 -- You received this bug notification because

[Bug 1820547] Re: 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

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.] ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https:

[Bug 1820547] Re: 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

Did you try using ppa-purge as instructed? ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1820547 Title: An unresolva

[Bug 1820547] Re: 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

** Tags added: bionic2cosmic ** Tags added: third-party-packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1820547 Title: An unresolvable problem occurred while calculating the upgrade. This