FWIW I'm now running Ubuntu 22.04 in Legacy mode and finding the workaround satisfactory.
ls -lh /boot/initrd*
lrwxrwxrwx 1 root root 28 Dec 1 13:56 /boot/initrd.img -> initrd.img-5.15.0-56-generic -rw-r--r-- 1 root root 107M Nov 30 11:46 /boot/initrd.img-5.15.0-53-generic -rw-r--r-- 1 root root 107M Dec 1 13:56 /boot/initrd.img-5.15.0-56-generic lrwxrwxrwx 1 root root 28 Dec 1 13:56 /boot/initrd.img.old -> initrd.img-5.15.0-53-generic
FWIW I'm now running Ubuntu 22.04 in Legacy mode and finding the workaround satisfactory.
ls -lh /boot/initrd*
lrwxrwxrwx 1 root root 28 Dec 1 13:56 /boot/initrd.img -> initrd. img-5.15. 0-56-generic img-5.15. 0-53-generic img-5.15. 0-56-generic img.old -> initrd. img-5.15. 0-53-generic
-rw-r--r-- 1 root root 107M Nov 30 11:46 /boot/initrd.
-rw-r--r-- 1 root root 107M Dec 1 13:56 /boot/initrd.
lrwxrwxrwx 1 root root 28 Dec 1 13:56 /boot/initrd.