Multi boot with ublue

General
1

Before i go on with a ublue install i want to be sure i understand the implication when it comes to multi-boot,

as of now i dual boot windows and fedora 43, both installed on the same disk.

So, if i want to keep booting windows and fedora i have to install ublue on a separate disk and after a ‘ujust regenerate-grub’ i ll have the three boot option listed in ublue grub,

if i want to use a single disk, I shoudn t expect to be able to boot another linux from the same disk, only working option would be to dual boot ublue and windows.

Am i right?

Thanks for helping

2

Whenever I’ve tried multi-boot setups, I’ve always run into problems using multiple bootloaders on the same disk or with chain boot loading. In my experience, the best way to do multi-boot on the same machine is to have a second disk and use the BIOS to switch between them. Essentially, the best approach is to disconnect one disk, install an operating system on it, then do the same with the other. After that, let the BIOS decide which one to boot using the boot selection key.

I haven’t actually read the documentation to know whether multi-boot is supported with Universal Blue distributions, but it wouldn’t surprise me if it’s not. There are just too many things that can go wrong with it.

3

ok, thanks,

so, installed aurora nvidia on a second disk,

i have a fedora alongside windows on the first disk and it doesn t appear in the boot selection key anymore,

will have to try and repair its grub i guess :frowning:

4

I’ve been running dual boot systems (Bluefin and Windows) on two systems for more than a year now. Both the desktop and laptop have the OSs installed on separate drives however. So far there hasn’t been any issues related to dual booting.

5

running the three without issues as well, only thing, i had to efibootmgr the old fedora because ublue overwrote it, same name i guess

also using the nvidia one, had to edit kernel param to be able to wake up from sleep

sudo rpm-ostree kargs --append=mem_sleep_default=deep

That being said, i found that page about running a fedora atomic alongside other os on the same disk,

beside it s not officially supported by ublue and it might require additional tweaks, are there risks to mess up with the other OSes

partitions?