Le 16/05/2021 à 19:09, Chris Green a écrit :
I want to add a second version of Ubuntu to my existing xubuntu 20.10
desktop machine, I want it to be a dual boot system.
I just want to end up with a boot menu that defaults to the existing
xubuntu 20.10 installation but will allow me to choose Ubuntu (server)
20.04 at boot time if I need to.
To add a slight complication my 20.10 installation has a separate
/boot partition and drive because the main NVME SSD isn't visible to
the BIOS.
I do not see any complication here. A separate /boot is common practice.
So I have the following drives:-
/dev/nvme0n1p2 ext4 48174 15748 29912 35% /
/dev/nvme0n1p3 ext4 896193 295874 554727 35% /home
/dev/sdb1 ext4 10016 183 9306 2% /boot
/dev/sdb2 ext4 109596 33138 70850 32% /scratch
/dev/sda1 ext4 938772 222399 668664 25% /bak
/dev/sdc1 ext4 937872 77 890087 1% /mnt
The new Ubuntu Server installation can go on /dev/sdc1 as that's empty.
What's the easiest (and least error prone) procedure for doing this?
Install Ubuntu Server in /dev/sdc.
Install its GRUB in /dev/sdc (I assume Xubuntu's GRUB is in /dev/sdb).
Boot Ubuntu Server from the BIOS boot menu, add
"GRUB_DISABLE_OS_PROBER=true" in /etc/default/grub and run update-grub
to remove Xubuntu from /boot/grub/grub.cfg. [1]
Boot Xubuntu and run update-grub to add Ubuntu Server to
/boot/grub/grub.cfg.
[1] This step is not needed if Xubuntu and Ubuntu server use different
kernels.
