fix committed:
https://git.launchpad.net/ubuntu-release-upgrader/commit/?id=390f55a383287396eb2e6ce91d2c6df098bc954a
fix committed:
https:/ /git.launchpad. net/ubuntu- release- upgrader/ commit/ ?id=390f55a3832 87396eb2e6ce91d 2c6df098bc954a