Reinstalled my work laptop earlier today.

1. IPU7 camera still doesn't work out of the box. Hoping there's an OEM driver released at some point.
2. Switching away from snap-based Firefox means a firefox that won't start up. I'm now stuck with Firefox in a Snap, which can't manage gnome extensions. Annoying paper cut requiring installing (ironically) a flatpak to manage extensions.
3. They removed the "Software and Updates" package from the default install, making for a worse experience for new users trying to fix driver issues
4. The dash-to-dock plugin that Cannonical default installs overrides some keyboard shortcuts (particularly super+q - my preferred shortcut for closing programs)
5. ptyxis is fine as a terminal, but all configs only go through dconf, so any changes you want require a pile of searching
6. sudo -E doesn't actually bring in environment vars, breaking at least some scripts.

Some of these come from Cannonical switching away from GNU userland tools. Some of these may be more Gnome choices. And some just suck.

If I wasn't stuck with Ubuntu because of software requirements, I would use nearly anything else.