As a workaround I have added a tld to my hostname, so the upgrade could continue:
hostname myhost.nonsense.com
see: http://askubuntu.com/questions/450028/how-do-i-set-the-tld-for-the-hostname
As a workaround I have added a tld to my hostname, so the upgrade could continue:
hostname myhost.nonsense.com
see: http:// askubuntu. com/questions/ 450028/ how-do- i-set-the- tld-for- the-hostname