The mirror of the Ubuntu archive you are using is an unofficial one, so
it was disabled during the upgrade process and this left your system
without an upgrade path. Please switch to an official mirror of the
Ubuntu archive using software-properties-gtk and try upgrading again.
** Summary changed:
- can not play videos except from youtube
+ upgrade failed to calculate due to an unofficial mirror
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1612886
Title:
upgrade failed to calculate due to an unofficial mirror
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