I changed fstab to...
# Entry for /dev/sda1 :
UUID=fc136849-3c01-496f-88fa-97ab0c9 / ext4 defaults 1 1
none /proc proc defaults 0 0
none /dev/pts devpts defaults 0 0
68dcf / ext4 defaults 1 1
# Entry for /dev/sda6 :
UUID=de242e12-f479-4ef2-8b72-4553798fe639 /home ext4 defaults 1 2
none /proc proc defaults 0 0
# Entry for /dev/sda5 :
UUID=a87ca906-76ae-42a4-988f-e729a288556c swap swap defaults 0 0
none /dev/pts devpts defaults 0 0
and it works also. I don't know why it was different in the first place. I know I didn't change it.
do I have to change fstab.old or fstab~ ?
and what about the lines I marked in blue? should they be there? if so, are they correct?
I've been around and/or used computers since the early 70s and I never had to do this stuff... lol
And I've been using Linux for 12 years and do this kind of stuff all the time.

You don't need to change the other files, as they are just backups of the old file. What you have now is correct in form, except for the lines I highlighted in
red. Delete those lines, and you should have no further problems. This is good!
