can't find in /etc/fstab

The file /etc/fstab is used for configuring file systems that need to be mounted at boot time. If a file system is not listed in /etc/fstab, it may still be mounted manually using the mount command.

If you are trying to find a specific file system that you think should be listed in /etc/fstab but cannot find it, you can try using the blkid command to see a list of all available block devices on your system. This will show you the UUIDs of each device, which can then be used to manually mount the file system.

To use blkid, simply open a terminal and type:

sudo blkid

This will show you a list of all available block devices on your system along with their UUIDs and file system types. From there, you can manually mount the file system using the mount command.