upgrade from 14.04 to 16.04 on digitalocean
133
How can I fix a 404 Error when using a PPA or updating my package lists?
107548
Where can I download Ubuntu 16.04?
35093
Upgrading from the command line?
10678
Upgrade to the specific php 7.1/7.2 from php 7.0 in Ubuntu 16.04
71792
Recommended ways to upgrade AlwaysOn AG from 2014 to 2016
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
102559
How to install package from newer distribution?
144172
How to upgrade to a point release from the same base release (12.04 to 12.04.03)
103445
Will painless upgrading from Drupal 8 alpha 3.x to beta be possible?
98421
How will people upgrade from 12.10 to later releases after 13.04 is EOL?
110148
Why does `do-release-upgrade` skip a version?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
43281
Upgrade Debian Jessie (8) to Buster (10) possible or need to go sequential in versions upgrades?
58979
How can I upgrade Ubuntu LTS to the next one offline?
84537
Using dpkg to install upgrade and dist-upgrade packages
63278
Update Linux Subsystem on Windows (Ubuntu) to 16.04
13970
Why am I not getting the Ubuntu 18.04 upgrade?