When you change a swap partition (let's say you removed and added a new one because you wanted to change paritions layout on a non-LVM setup, and swap contents is not something to bother keeping), you'll have to update /etc/fstab; but that's not actually enough. With only this, initramfs will wait for a bit and complain that the resume partition couldn't be found. This is due to the setting in /etc/initramfs-tools/conf.d/resume which should match your preferred swap partition. Once updated, don't forget to re-run update-initramfs -u -k all.