Okay, I thought I would update this with everything I've tried. Not sure
if this will help anyone, but what didn't work for me may work for them.

If the filesystem mounts as -ro then I can usually get it to mount rw using:
 > sudo mount -o remount,rw /
And if that works then I can edit the /etc/fstab file successfully, though 
sometimes I get the message that it isn't mounted, and trying to mount it 
without the "remount" option gives the message that it is already mounted. Last 
time that happened I had to boot from the live cd and change the fstab file 
from there.

I'd recently tried to add my Windows 7 partition to the fstab file so I
commented that out, but it didn't help.

I used:
 > sudo blkid
To check the uuid's in the fstab file were correct and they were so that didn't 
work.

 > fsck.ext4 /dev/sda5
(change "ext4" depending on file system type and "/sda5" depending on partition 
number)
This came up clean too.

 > fsck -fy /dev/sda5
Was clean

 > fsck -c /dev/sda5
Always reports making a change and asking for a reboot, but the filesystem 
still doesn't mount.

I don't think my fstab entry is wrong, but I'm not certain so if someone
could post a good fstab line for the root filesystem I'd be grateful.
I'll write down what it currently is next time I need to post.

Does anyone know if there's a way to repair ubuntu without completely
re-installing? I have some data on there and I'm not sure I have enough
room to back it up to, which means I'm reluctant to wipe the partition.

-Scut

-- 
Mount of root filesystem failed
https://bugs.launchpad.net/bugs/468450
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