I have reproduced this bug again but now I have a better work around. When ubiquity asks for your name on the page where you create acounts and setup your hostname and it says your custom hostname is invalid put the cursor in the filed for your name and hit backspace to delete the last character of your name then type it again. And it now accepts a valid hostname as valid and continues to install.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1398977 Title: all hostnames on network appear taken when changing hostname. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1398977/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
