On Mon, 2024-06-03 at 13:53 +0200, Patrick Dupre via users wrote:
I wish to add that efibootmgr does not list the sdc3 installation.
By default, it'll only show the boot options that installations have entered into it. If your install didn't do that, you can add entries, yourself.
Have a look at the man file for efibootmgr (or other documentation). If you're not sure what you have to do, post back what you think you might have to do, to consult with people here.
I can't tell from your posts in this thread whether you're trying to use a UEFI or BIOS system, or shoehorning one install type into the other system.