I will share my experience.
Installation on Pixel 3A XL.
Reinstallation of Ubuntu via USB.
Originally, USB 20.04 was installed and updated to 24.04.
Due to some inexplicable minor issues, I decided to reinstall 24.04 via USB
PC Ubuntu 24.04 installer 11.02
It ends up in FastBoot and does not load.
I tried a second PC with the same installation and got the same result.
Only the third, older PC with Ubuntu 22.04 and installer 0.9 helped.
The installation of UB.Touch 24.04 went smoothly.

I apologize for using a translator.
Ota

Translated with DeepL.com (free version)

This also happened to me, the GSM part disappeared.
The solution for two devices after this flawed update was.
Reinstall help PC - usb ubports-installer

Personally, the GPS works, but it is unreliable, wifi must not be turned off and sometimes the phone must be completely restarted.
then sometimes it takes minutes or tens of minutes for the GPS to find the location