Upgrade issues 17.04 - 17.10 apt update failing
1520
How to install software or upgrade from an old unsupported release?
24603
apt-get upgrade gives "403 forbidden" error
120161
Ubuntu 19.04 problems install upgrades
151605
upgrading from 15.10 to 16.04 apt not installed
12592
Unable to 'apt-get dist-upgrade' due to appstreamcli database error
12614
Upgrade problem
80233
Upgrade to 20.04 from 19.10 isn't available
118978
Not all updates can be installed: partial upgrade
77062
Updates stopped and fix-broken install is broken
147407
Apt-get fails on 16.04 or 18.04 installing mongodb
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
9322
Software Updater Issue 16.04
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
44209
Problem with update-manager: No module named 'apt_pkg' in Ubuntu 13.10, having installed Python 3.4 on /usr/local/lib
110148
Why does `do-release-upgrade` skip a version?
77705
Unable to upgrade in ubuntu
135383
Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages