I installed Debian Testing on this computer to play with, but allowed the installation to use the swap partition. When I booted into the main installation (Debian Bullseye Gnome), I found it did not have swap memory available, which is not good because with only 4GB of RAM, it needs swap memory if I have a browser and other applications open. (Unfortunately it has one card slot, so upgrading the memory would involve purchasing an expensive 8GB card, unlike my laptop which had a free slot so I could drop in am extra 4GB card for not too much money).
The solution was to get the main installation to share the swap partition by updating the UUID.
# blkid /dev/sda3
Got me the UUID given to the swap partition on this computer by the new install.
I then replaced the old, now non-working UUID with the working UUID from the command above.
# nano /etc/fstab
Apparently it's OK for the two installations to share the swap partition, as long as it is not used for hibernation, which it is not.
askubuntu again.
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