*** This bug is a duplicate of bug 1069133 ***
https://bugs.launchpad.net/bugs/1069133
Thanks for your reply. I understand that I need to disable some PPA, but
it seems that oibaf doesn't do the trick. When I run 'sudo ppa-purge
oibaf', I get the following output:
Updating packages lists
W: There is no public key available for the following key IDs:
1397BC53640DB551
PPA to be removed: oibaf ppa
Warning: Could not find package list for PPA: oibaf ppa
Is there any other PPA that I should try to disable?
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https://bugs.launchpad.net/bugs/1611430
Title:
Cannot calculate upgrade from 14.04 to 16.04
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