If you try adduser håkan. adduser: To avoid problems, the username should consist of letters, digits, underscores, periods and dashes. For compatibility with Samba machine accounts $ is also supported at the end of the username
-- Cannot create a user "håkan" https://launchpad.net/bugs/23475 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
