This was a practical problem that i faced before, that is why i came up with the solution. Most times you’ll encounter the failed to mount /etc/fstab or Cannot read /etc/fstab: file not found; these are the two most common errors with /etc/fstab file.
If the file is missing(say accidentally deleted), then you need to recover it, in case you have a backup you can restore the it or else manually add all the necessary auto-mount entries.