So I am still stuck with the grub-install-error. It seems it can not install the bootloader (this happens right at the end of the installation process). And the drop-down-menu only allows to the Master Boot Record of the full disk (/dev/nvme0n1), while the actual boot-partition would be /dev/nvme0n1p1 with mountpoint /boot
There is also the possibility to instal the boot-loader into /boot, but it may be that this tried to install to teh /boot-partition of the LiveUSB (but maybe I am wrong, in any case also this doesn’t work).
Third option which is given in the drop-down-menu is to not install a bootloader at all, but this to me doesn’t make sense.
If I chose the ‘default’ installation wiping the disk, I get 1 dos-partition scheme with 3 partitions /dev/nvme0n1p1 for /boot, /dev/nvme0n1p2 for / (including /home) and /dev/nvme0n1p3 for swap.
In this case everything works, but as soon as I turn /dev/nvme0n1p2 and /dev/nvme0n1p3 into a a physical volume (on dos or gpt disk label), the installation fails with one of the errors given above.
I use the newest Live-Distro, and I do
sudo apt update
sudo apt upgrade
before anything else.
I any case I have the suspicion that it has to do in one way or another with my Samsung SSD 970 PRO 512GB (my Librem15rev2 contains the EVO-version which shows up as /dev/sdb ).