Upgrade from 11.10 to 12.04 failed
63772
I can't boot into a usable system after updates. What should I do?
110148
Why does `do-release-upgrade` skip a version?
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
74079
How to Upgrade Ubuntu 12.04.2, 12.04.3 to 12.04.4, the next Hardware Enablement Stack?
13054
Failing package manager?
113056
How to upgrade from 12.04 to 12.10 using CD?
36703
How do I upgrade from 12.10 to 13.04?
404
Last upgrade crashes network manager (no internet connection, no applet)
5877
"Failed to fetch" while updating
83107
12.04 continuously offering partial upgrade
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
151579
Interrupted upgrade from 15.10 to 16.04, Ubuntu boots into black screen
80233
Upgrade to 20.04 from 19.10 isn't available
23096
How to remove obsolete packages after failed release upgrade via do-release-upgrade on Ubuntu?
36935
Windows 8.1 Upgrade fails with error code 0x80070652
116445
"Can't check signature: public key not found" while upgrading, why?
90512
Upgrading from 12.10 WUBI install to 13.04