Het is me gelukt om het op die manier te doen, hieronder volgt dan de inhoud van /fstab, met helemaal onderin de regel die ik heb ingevoegd :
[# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/dev/sda1 / ext4 errors=remount-ro 0 1
# /home was on /dev/sda6 during installation
UUID=bcc5d7d8-d19d-4e9f-acf7-9c5bcaa24427 /home ext4 user 0 2
# swap was on /dev/sda5 during installation
UUID=786f896d-f339-4b2d-9ce7-09c5845bff90 none swap sw 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
/dev/sdb1 /media/sdb1 ext4 defaults 0 0
UUID=7fb19953-98d7-46a0-a0a0-9a4d3b95d206]
/fstab_oud heb ik ook gevonden en volgt nu :
[# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/dev/sda1 / ext4 errors=remount-ro 0 1
# /home was on /dev/sda6 during installation
UUID=bcc5d7d8-d19d-4e9f-acf7-9c5bcaa24427 /home ext4 user 0 2
# swap was on /dev/sda5 during installation
UUID=786f896d-f339-4b2d-9ce7-09c5845bff90 none swap sw 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
/dev/sdb1 /media/sdb1 ext4 defaults 0 0 ]
Ik weet niet of het nog van belang is, maar in de bovenste regel van gedit (naast de 3 bolletjes) staat de naam van fstab en fstab_oud bij beiden tussen haken [read-only]
En nu dan nog de gegevens in de Terminal van het commando [sudo blkid] :
[ubuntu@ubuntu:~$ sudo blkid
/dev/loop0: TYPE="squashfs"
/dev/sda1: LABEL="Data schijf2" UUID="7fb19953-98d7-46a0-a0a0-9a4d3b95d206" TYPE="ext4"
/dev/sdb1: UUID="0b432bae-48bc-4bc6-8795-435e42c369a9" TYPE="ext4"
/dev/sdb5: UUID="786f896d-f339-4b2d-9ce7-09c5845bff90" TYPE="swap"
/dev/sdb6: UUID="bcc5d7d8-d19d-4e9f-acf7-9c5bcaa24427" TYPE="ext4"
ubuntu@ubuntu:~$ ]
Ik hoop dat het nu wat duidelijker wordt, waarom Ubuntu bij mij niet opstart.