Note to self:
If during a Linux update you get the following error:
update-initramfs: Generating /boot/initrd.img-whatever W: initramfs-tools configuration sets RESUME=UUID=some-uuid-goes-here W: but not matching swap device is available. I: The initramfs will attempt to resume from /some/device I: (some-other-uuid-goes-here) I: Set the RESUME variable to override this
Check the content of the file /etc/initramfs-tools/conf.d/resume which sets the above mentioned RESUME variable. It probably contains an old UUID. Change it to the correct one and rebuild your ramfs with
update-initramfs -u
That should do the trick.
The current swap partition is usually given in /etc/fstab.
I found this information on this blog.