Out of space

[Ralf Mardorf]

I only can explain you how to use command line to mount, but I don't
have time to do it now.

Your Ubuntu installs likely by default have file managers, perhaps
Nautilus for Ubuntu and maybe Dolphin for Kubuntu. The are most likely
able to mount partitions automatically or at least provide an option to
mount by mouse click. I'm not using this, I'm using command line.

Simply mount all available partitions and from each partition
containing /etc/fstab, attach the fstab to an email. It seems to be 3
Linux installs, IOW it should be 3 different /etc/fstab files.