Yes, i have received the message and i have used ppa-purge and purged
all ppas, but still no luck...
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https://bugs.launchpad.net/bugs/1826725
Title:
Cant update to 19.04 Cant calculate
Public bug reported:
The update with do-release-upgrade fails with error:
An unresolvable problem occurred while calculating the upgrade.
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate
