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?
Keep in mind that none of these phones support the mainline kernel.
There are only 3 phones that supports mainline kernel: PinePhone, PinePhone Pro and Librem 5.
All other phones use Halium. In short, because there are no drivers, your phone will use Android container to talk to hardware.
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.