Произошло следующее:
ubuntu@ubuntu:~$ ubuntu-device-flash touch --channel=ubuntu-touch/stable/ubuntu
Get https://system-image.ubuntu.com/channels.json: dial tcp: lookup system-image.ubuntu.com on 127.0.1.1:53: no such host"
Мне пришлось записать Ubuntu 16.04 на флэш-накопитель при загрузке с него, потому что этот пакет недоступен для Ubuntu 18.04.
Ubuntu Touch is no longer maintained or hosted by Canonical. You need to follow the instructions on https://devices.ubuntu-touch.io to install for your device.
If your device is supported, you can still use ubuntu-device-flash
but you must pass the server argument as well as correct channel:
ubuntu-device-flash --server https://system-image.ubports.com touch --channel ubports-touch/16.04/stable
The old servers and channels will not work any more.