Grub died after timeshift backup

Update (sigh…).
It seems that my latest problem is related to the nvidia drivers and additionally to a missing mount.ext4 file (how come??). I also found out that i have to go back to school to learn proper reading - yes, timeshift ate my bootsector (or efi or whatever) so i couldnt boot after restoring, but i also messed things up by mounting my efi to /boot and not to /boot/efi (SIGH, again.) Therefore, after too many trials, i resign and will reinstall the whole system. Luckily i have a separate user partition so things could be worse…