Not able to update/upgrade to latest Ubuntu, since "Your Ubuntu release is not supported anymore."
1520
How to install software or upgrade from an old unsupported release?
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
76905
Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
114305
On really old Ubuntu 6.06 - How to upgrade
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
41519
What can I do if a package is not available on the newest version of Ubuntu (18.04) but is available on older versions?
16837
Unable to upgrade from 14.04 to 14.10 "Cannot Calculate Upgrades"
19288
Update manager doesn't offer an upgrade to the new release
76241
"no public key available" while upgrading using update-manager
65099
Unable to install any updates through update manager/apt-get upgrade
119943
Where can I find a repository for older unsupported releases?
93942
How to fix "Failed to download repository information" error while updating?
140893
Error when using apt-get update
30747
Encountered "/usr/sbin/grub-mkconfig: 8: /etc/default/grub: 4: not found" error while updating
7580
How to safely upgrade from an older Ubuntu version to a newer one?
94171
Why Does Software Updater Say No updates Available, but apt-get upgrade Shows updates available?
9901
How to upgrade from 18.10 to 19.10, using the command line?