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
That should do the trick.
The current swap partition is usually given in /etc/fstab.
I found this information on this blog.