The initramfs will attempt to resume from /dev/dm-1

It may happen when you install another OS alongside the first one. Means that swap partition has changed UUID and you need to adjust that in fstab.

To check that run sudo blkid, that gives you actual UUIDs of your swaps, swapon -s will show which one is active, then compare its UUID to the one in /etc/fstab.

If different, edit/create the file /etc/initramfs-tools/conf.d/resume with RESUME=UUID=<swap UUID from blkid>. THen run update-initramfs -u -k all and if it doesn't complain, you win.

This might actually be a (not even new) bug as mentioned here. They and others suggest to add RESUME=none to /etc/initramfs-tools/conf.d/resume.

I needed to sudo-create the file /etc/initramfs-tools/conf.d/resume first on my U 19.04 machine. With sudo update-initramfs -u -k all you test and deploy the initramfs image. See details here.