Hash Sum mismatch error when trying to upgrade
4853
Trouble downloading packages list due to a "Hash sum mismatch" error
64509
Can't update from official repositories [Error 409]
10023
'Some index files failed to download' while updating
20399
How do I upgrade from 14.04 LTS to 16.04.1 LTS?
5316
Update from 14.04 to 16.04 failed with GPG error
105335
How do I upgrade my Ubuntu server from one LTS version to another? Is this safe?
35093
Upgrading from the command line?
12578
How do I upgrade to a newer version of Ubuntu?
16837
Unable to upgrade from 14.04 to 14.10 "Cannot Calculate Upgrades"
9901
How to upgrade from 18.10 to 19.10, using the command line?
95210
APT wedged by kernel version mismatch
2670
Why is "No new release found" when upgrading from a LTS to the next?
6173
"method driver /usr/lib/apt/methods/https could not be found" update error
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
13970
Why am I not getting the Ubuntu 18.04 upgrade?
118978
Not all updates can be installed: partial upgrade
150518
Version error when uploading Change Set