Reinstall Ubuntu option is disabled

Question

I have a Ubuntu and Windows on my machine and I have to reinstall Ubuntu without losing any of my data, /home folder, but reinstall ubuntu option is grayed out for some reason.

What should I do in order to reinstall it without losing files and programs?

Solution

You can click on "Something Else" and then manually reinstall it. Choose the same paritions for the same mounts you had before such as /home and root (/) and just make sure the format checkbox is NOT checked. It will reinstall overtop of everything (overwrite) but won't delete anything. Of course as always, you should backup your /home folder before, just in case

Comments

[Francesco Boi]

how to know which is the boot partition when having for example /dev/nvme0n1 (seems the whole disk), /dev/nvme0n1p1(fat32) and /dev/nvme0p2 (ext2)? It is asking foe the Device for boot loader installation

[Pierre ALBARÈDE]

The boot partition can't be fat32 so it is the other one.