Essential information missing from suzu device page
https://devices.ubuntu-touch.io/device/suzu/ suggests that one only has to download an run the installer. However. this is guaranteed to fail without the necessary preparatory steps:
- Ensure you have upgraded the stock firmware at least to Android 7, else you can't flash the OEM binaries for AOSP
- Enable developer mode,
- Enable ADB debugging,
- Enable OEM unlocking,
- Get an unlocking code from Sony,
- Reboot to fastboot and unlock the bootloader using the code, bootloader
- Download the OEM binaries for AOSP from sony, flash them in fastboot.
Only at that point is it safe and likely successful to run the installer. I first naively downloaded and ran the installer and learned the hard way how many things can fail, including that the installer tries to unlock the bootloader silently but of course this has to fail without a code. But the biggest nuissance was that later, the UBPorts installer got as far as installing the Ubuntu Recovery, which then got into a bootloop every 30 seconds, because the OEM binaries for AOSP hadn't been flashed. Sure I eventually scraped together the various bits and pieces of information but I would have been spared lots of frustration if the above steps had been listed on the device page instead of giving me the illusion that I just have to run the installer.
P.S.: http://docs.ubports.com/en/latest/userguide/install.html says "we also have manual installation instructions for every device on the devices page", which would have been great, but this is not the case. IIRC, there is a similar message in the UBPorts installer.