On UT, in order to install stuff from the ubuntu repos and use xmir, you need to set up a libertine container because the rootfs is read-only by default, and is overwritten with each update.

It's a pain in the butt. Bonus, if even a single package doesn't download properly while initializing the container (possibly because UT suspended your terminal session because you switched to your web browser to surf instead of boring yourself to death watching packages download), the container setup fails, and you get to start all over again. It really sucks. If using xmir, there are also major issues with DPI. Everything is so tiny!

Honestly, just using Android or LineageOS with an Ubuntu chroot, XSDL, and Hacker's Keyboard is less hassle than UT's libertine crap. It's actually easier to get and use software from the Ubuntu repos on Android than it is on Ubuntu Touch, which is shameful.

On PM, it's totally painless, you just need to expand the rootfs file or else you'll run out of space. The PM install scripts come with a script for doing that easily. XWayland is well-integrated, you wouldn't even notice it, except for the few glaring bugs.