Error when upgraded operating system from Ubuntu 16.04 to 18.04> do-release-upgrade
1520
How to install software or upgrade from an old unsupported release?
63176
How can I update to Ubuntu 21.04?
73068
cant install or remove anything on 18.04 cause of DPKG error
12614
Upgrade problem
30747
Encountered "/usr/sbin/grub-mkconfig: 8: /etc/default/grub: 4: not found" error while updating
136970
Error occurred in deployment step 'Add Solution': Operation is not valid due to the current state of the object.?
72152
Upgrading 16.04 to 16.04.1
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
129143
Error upgrading to High Sierra
107009
ubuntu 18.04 apt-get upgrade problem "redirection loop encountered."
144172
How to upgrade to a point release from the same base release (12.04 to 12.04.03)
97346
Is it possible to skip releases during an upgrade?
29191
Upgrade to 18.04 from 17.10
15870
dpkg-divert: error: rename involves overwriting error after upgrading from 16.04 to 16.10
151579
Interrupted upgrade from 15.10 to 16.04, Ubuntu boots into black screen
98844
upgrade 14.04 with errors and shows red sign on top
4660
Should I be offered the option to upgrade to 18.04.1?