Le 23/11/2021 à 13:57, Yvan Masson a écrit :
I found first an answer for the second question : the wiki (https://wiki.debian.org/GrubEFIReinstall) explains exactly how to recover from such issue. This is what I did and I can now only boot on my encrypted Debian 11.Hi list,I have a laptop with two drive, historically installed with an encrypted Debian 11 booting in UEFI mode (done with Debian Installer).I just installed Debian 12 without encryption in a small partition. Unfortunately, I can not boot Debian 11 anymore, grub-efi only shows the Debian 12 install.Any help to make both install boot would greatly appreciated. Being able to boot Debian 11 only would also be great if the dual boot is not possible.
For the first question, I found different solutions on AskUbuntu (https://askubuntu.com/questions/617045/how-do-i-install-two-independent-ubuntu-installations-on-a-single-hard-drive-wit) : I chose the method with two EFI partitions, because it seems easier to me (but this might no be true). If you do this, do not forget to modify /etc/fstab so that each install uses the proper EFI partition.
Regards, Yvan
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