My system is a dual boot Win 7 / Ubuntu 14.04LTS / Grub.
My objective is to have a fresh install 18.04 on top of the existing 14.04, given there is the other OS.
I found several sources, but mostly dealing with 16.04 -> 18.04. I guess it should work right away.
Should I take any special consideration to make it work, different from a regular installation of 18.04 on a Win 7 taking up the whole disk?
(Now I will already have the extra partitions that the Ubuntu installer creates, etc.)