My /etc/initramfs-tools/conf.d/resume contained "RESUME=/dev/sdb5", but my swap partition was /dev/sda5. I changed the file to /dev/disk/by-uuid/{correct UUID} and things are now working correctly.
My /etc/initramfs- tools/conf. d/resume contained "RESUME=/dev/sdb5", but my swap partition was /dev/sda5. I changed the file to /dev/disk/ by-uuid/ {correct UUID} and things are now working correctly.