Hello, I am looking for the optimum phone to install Ubuntutouch on, and I particularly want optimum battery life and, of course, a great camera. Which phone would you recommend I am looking at Xiaomi Poco x3 or M3 otherwise they are big for me. I currently have a Pixel 6 and Grapheneos but I would like a Linux UT in the past I also had Xperia 10 and Sailfish os. What would you recommend for everyday use with a good camera?
The entire idea of Ubuntu Touch device support, was to be based on Halium. It's a bit different than regular mobile Linux (outside of Droidian, of course), where mainline is a requirement.
I probably phrased it wrong. There only 3 devices that can run mainline kernel and have fully functioning hardware.
Yes, you can run mainline Linux on OnePlus 6 without camera and USB-OTG. I also think that there are some other minor issues. But on UBT camera in OnePlus 6 will work through Halium: https://devices.ubuntu-touch.io/device/enchilada
I own OP6, on Ubuntu Touch it has an annoying bug with shutdown (see my other reply here).
On mobile Linux, though, it's quite close: camera is missing, GPS is a bit finicky about SIM card you use, I did not seriously test battery life yet. I plan to give it a proper try to daily drive it soon.