Thanks for reporting this problem. We need some more information to find the source of the problem.
First, just to check, I know this seems silly but the command is: update-manager --devel-release and not update-manager --devel -release It could just be the web page but it looks like you have an extra space in there. If that isn't the case then could you please attach the 3 log files from /var/log/dist-upgrade ** Changed in: update-manager (Ubuntu) Status: New => Incomplete ** Tags added: gutsy2hardy -- unable to upgrade to dev. release 8.04 using instructions supplied on Ubuntu web site; a blank window appears and dissapears? https://bugs.launchpad.net/bugs/206111 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs