The obvious workaround is to launch the upgrade with LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8 LANGUAGE=en_US.UTF-8 update-manager -d
Still should be fixed (obviously).
The obvious workaround is to launch the upgrade with en_US.UTF- 8 update-manager -d
LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8 LANGUAGE=
Still should be fixed (obviously).