how to fix a incorrect fstab
If you messed up your fstab you may can’t boot your linux machine. You will need a recovery usb or disk attached to the system, also a dual boot linux will do the job.
Lets say you have missconfigured a fstab entry and the server is looping through the boot loader. You can fix the fstab file after booting from a recovery media with the following commands:
lvm vgscan -v # this will show your vgs vgchange -a y ubuntu-vg # this will activate your vg with the name ubuntu-vg lvs # this will list your lvs mkdir /mnt/mount mount /dev/mapper/ubuntu-vg/ubuntu-lv /mnt/mount
Now your lv should be mounted and you can edit your fstab file under