I have a dual boot system with two partitions for Ubuntu and Arch. In Arch, whenever I need to access the Ubuntu partition, I am asked for the password.
I added a line in fstab as follows:
UUID=xxxxxx /run/media/username/Ubuntu ext4 defaults,user,noauto 0 1
I do not want to mount it automatically but allow the user to mount it without authentication.
The user is in the users, sys, storage and power groups.