I think what that error means is just that the changes weren't going to
be reflected in the /dev/sda* devices until reboot. I've seen that error
before on start-up if the devices were in use, which apparently is
always the case even with the LiveCD because it automatically uses the
swap partition. I did "Swap Off" from within GParted before doing any of
the actions, but I think maybe something made the OS automatically start
using it again during GParted's execution so that it later produced that
message during processing. This could be what triggered the problem in
the first place, since /dev/sda5 is the swap partition and also the one
where the fatal error occurred.

My interpretation of the log is that sda6 has been resized correctly on
disk, but that the partition table has been corrupted somehow, hence the
"Invalid partition table on /dev/sda -- wrong signature 0".

I think I am going to try to backup all the information that is still
accessible with fdisk and then reboot into the LiveCD again to see if
what GParted sees is any different. If not then I'll still have the
saved fdisk data and I can try to reconstruct the partition table.

-- 
GParted destroyed my partition table: "Invalid partition table on /dev/sda -- 
wrong signature 0."
https://bugs.launchpad.net/bugs/434463
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