I just upgraded an old machine from 23.04, and I noticed a slight difference in the command line Wimpy posted in his announcement versus yours. Wimpy wrote:
update-manager -c -d
I have a few issues - like "Welcome" and Software Boutique" are just gray boxes. Grub (dual boot) was a blank as well - until I hit the right shift key. So far it seems to be running fine.
EDIT
Almost forgot. During the upgrade the language switched to something that looked a bit like Greek or Cyrillic. Since I didn't know what it was saying - I just hit enter whenever it paused for input. Was relieved upon reboot to find English.