When starting linux OS and that fsck fails with fsck.ext4: No such file or directory while trying to open /dev/mapper/myvg_mylv, usually the disks are mounted in read only mode.
To solve this issue, you’ll have cancel fsck and login to the console.
Remount / filestem as read only with mount -n -o remount,rw /
After that, you will be able to modify /etc/fstab and remove the entry that does not exists.
Reboot the OS and wait for fsck to finish.