upgrade from 12.04 to 14.04 via CD/USB image
58979
How can I upgrade Ubuntu LTS to the next one offline?
55725
Can I install the free Windows 7/8 -> 10 upgrade on a new empty drive?
107792
Update information outdated, "Failed to fetch cdrom"
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
35093
Upgrading from the command line?
29191
Upgrade to 18.04 from 17.10
152244
How can I create a bootable USB disk from a CD image?
114305
On really old Ubuntu 6.06 - How to upgrade
44924
Install Ubuntu from ISO image directly from hard disk of a system running Linux?
87236
How to upgrade Ubuntu 12.04 to 13.10?
120436
Point Release upgrade from 14.04.1 to 14.04.2?
8837
Is it possible to install Ubuntu without a CD or USB drive?
72152
Upgrading 16.04 to 16.04.1
15687
How do I resume a release upgrade?
19218
How do I install an application from a .dmg disk image?
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
128002
Can I use a USB stick for a normal install? (to get platform adaptability)