= Ubuntu Server installs =
There used to be minimal installers and a python commandline utility to build KVM images. Not Enterprise enough, I suppose.
There is still a minimal ISO, hidden away:
* 20.04: http://archive.ubuntu.com/ubuntu/dists/focal/main/installer-amd64/current/legacy-images/netboot/mini.iso
= Notes on chroot'ing from SystemRescueCD or the like =
You can mount it like so:
```
lang=bash
# Mounting a classic MBR/Legacy install
sudo mount /dev/sda1 /mnt
# Or, mounting a UEFI install, you may find the first partition is actually an EFI partition rather than your root. So instead it's more like:
sudo mount /dev/sda2 /mnt
sudo mount /dev/sda1 /mnt/boot/efi
# Either way, then mount all the devices from the live session
sudo mount --bind /dev /mnt/dev
sudo mount --bind /dev/pts /mnt/dev/pts
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
# And now chroot into a shell in your existing install
sudo chroot /mnt
```
But if you're fixing GRUB on an EFI system and have booted into SystemRescueCD (or a live Kubuntu USB or such) in UEFI mode you may then find that running `grub-install` returns
```
grub-install: warning: EFI variables cannot be set on this system.
grub-install: warning: You will have to complete the GRUB setup manually.
```
You just need to run `grub-install --removable` to avoid that, having bootstrapped into this via EFI USB boot was how I got there myself certainly as per https://superuser.com/a/1749282