Does this seem to be an error or something else? - Upgrading Ubuntu 13.04 to 13.10
1520
How to install software or upgrade from an old unsupported release?
20751
Problem upgrading Ubuntu 9.10
98844
upgrade 14.04 with errors and shows red sign on top
17645
Unable to upgrade pip
31506
How do I update Ubuntu manually?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
19288
Update manager doesn't offer an upgrade to the new release
76241
"no public key available" while upgrading using update-manager
36354
Why am I not able to shutdown, log-off and restart after an upgrade to Ubuntu 13.10?
127196
"Error processing package" - apt upgrade cannot run due to package configuration errors
76628
Update to 3.13 kernel on Ubuntu 13.10
123413
Will apt-get dist-upgrade upgrade my system to a newer version?
65099
Unable to install any updates through update manager/apt-get upgrade
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
80233
Upgrade to 20.04 from 19.10 isn't available
26387
After Upgrade to Ubuntu 20.04: "Oh no! Something went wrong"
12534
14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed