[tapia]

Maybe try Ubuntu phone? [1] It is an officially supported device of UBports.

[1] https://ubports.com/de_DE/devices/promoted-devices

[bscphil]

Unfortunately, I believe the supported phone is the Nexus 5. The 5X is not a different version of the 5, it's the next generation of the smallest Nexus phone line, since the "6" was already taken. The numbering went Nexus 4, 5, 5X.