When /etc/fstab is changed and saved run systemctl daemon-reload

Change the value of size= to your needs

tmpfs /tmp tmpfs defaults,noatime,nosuid,nodev,noexec,mode=1777,size=512M 0 0

Normally, only the superuser can mount filesystems
However, when fstab contains the user option on a line, anybody can mount the corresponding system
Addition example for fstab

LABEL=TheLabel /mnt/somemountpoint vfat rw,noauto,relatime,users,owner,group,uid=1000,gid=1000,fmask=0022,dmask=0077,iocharset=utf8,shortname=mixed,showexec,flush,errors=remount-ro	0 0

Add a line to sudoers using visudo as root

user     ALL=(root:ALL) NOPASSWD:/bin/mount -L TheMemoryDeviceLabel /mnt/themountpoint/

Only the user that mounted a filesystem can unmount it again
If any user should be able to unmount, then use users instead of user
The owner option is similar to the user option, with the restriction that the user must be the owner of the special file
The group option is similar, with the restriction that the user must be member of the group of the special file

When more than one installation of Linux is made in different partitions with one common swap partition the UUID of the swap partition can be set wrong in the

/etc/fstab

file of one or more of the installations. If this is the case the message “A start job is running for /dev-by-UUID/someUUID [a countdown counter for 1 min 3- seconds]” is displayed

This can be solved by changing the UUID of the swappartition. The right value can be found by running the command, as root

blkid | grep swap

and checking if the UUID found with blkid is the same as the one in /etc/fstab for the swap partition. If not, put the UUID found with blkid in /etc/fstab. The line should look like this

UUID=feabc53a-b37e-5819-b3fa-47504d368472 none            swap    sw              0       0

Save /etc/fstab and reboot. The issue should be solved now

Put a # for the original line of the swap partition Add this line, replace x in sdx with the number of the swap partition

/dev/sdx  none swap defaults 0 0

to /etc/fstab. Save /etc/fstab and reboot

When a partition is removed, remove its entry in /etc/fstab also.If not, fsck will report an error in the boot process and the user is asked to enter the root password to enter a maintenance shell or Control-D to continue

man fstab
For options see man mount since in fact mount comands are listed in fstab
fstab - Debian Wiki
fstab. Also:Writing to FAT32 as NormalUser
Fstab - Ubuntu Wiki
Howto fstab
Setuid on Wikipedia

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