Starting to actually work more than it did before, I will post the system.img and halium-boot.img files for people who want to test for this specific device. The sources are in https://github.com/WolfLink115/UbuntuTouchHTCOneM7/ if you want to work on them yourself. This system.img has the udev rules and a (hopefully working) ofono patch for mobile data. This port is currently working, but still a WIP. Check readme for more details on the port.