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This is the output of boot-repair:

Bootsektor wurde erfolgreich repariert.

Bitte auf ein Papier die folgende Adresse notieren: https://paste.ubuntu.com/p/h58hKSrJ9y/

Falls Sie ein Startproblem haben, geben Sie hier diese Adresse an: boot.repair@gmail.com oder in Ihrem bevorzugten Hilfeforum.

Sie können Ihren Rechner nun neu starten.

Please do not forget to make your UEFI firmware boot on the Ubuntu 21.04 entry (nvme0n1p1/EFI/ubuntu/shimx64.efi file) !

Assumptions:

  • I installed new Ubuntu 21.04. on /dev/nvme1
  • grub2 is installed on /dev/nvme0

Expected: Old Ubuntu 20.04. is bootable from dev/nvme0

Actual: Only new installation of Ubuntu 21.04. boots in grub2

This is my /etc/grub.d/40_custom:

menuentry "ubuntu 20.04" {
     insmod part_gpt
     insmod chain
     set root='(hd0,gpt2)'
     chainloader /EFI/ubuntu/shimx64.efi
}

How to add Ubuntu 20.04. to grub menu?

Leder
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    Is old install encrypted & new install not encrypted? You need drivers. sudo apt-get update && sudo apt-get install lvm2 cryptsetup Then run sudo update-grub. Your drive as seen from grub may be hd1, not hd0. I prefer labels now: https://askubuntu.com/questions/344125/how-to-add-a-grub2-menu-entry-for-booting-installed-ubuntu-on-a-usb-drive/344359#344359 – oldfred Jul 10 '21 at 19:50
  • thank you, but the commands do not change my Grub2 behaviour: I will try from USB live filesystem next... – Leder Jul 12 '21 at 09:49
  • Can you do the configfile type entry to the other install? On my system boot drive is always hd0. So when booting a grub on drive normally sdb, it is hd0 and all other drives are then in order. Unless I also have a flash drive plugged in and then flash drive is sda on reboot and hdX. Often have to experiment. – oldfred Jul 12 '21 at 15:01

0 Answers0