Downgrade to genuine version, using ppa-purge script, then also deactivate the
other possible ppas.
And run 'gtkorphan' & 'bleachbit' (as root, carefully select options) to clean
the system.
Next step is to reboot; at that point the dist-upgrade script should be able to
set bionic as expected.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1769576
Title:
not able to upgrade from ubuntu 16.04 to 18
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