And while I didn't meant that it's 100% impossible to create such usernames, it is really not a good practice since programs distinguish username from UID by the first character.
Therefore I'd like to make this bug `invalid`. ** Changed in: adduser (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to adduser in Ubuntu. https://bugs.launchpad.net/bugs/1072556 Title: Can not adduser with just number Status in adduser package in Ubuntu: Invalid Bug description: Was trying to add a user via adduser with just the username of 1600 and the following is displayed: adduser: Please enter a username matching the regular expression configured via the NAME_REGEX[_SYSTEM] configuration variable. Use the `--force-badname' option to relax this check or reconfigure NAME_REGEX. I checked the options fore the NAME_REGEX in /etc/adduser.conf and it is commented out and shouldn't be affecting the adduser command. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/adduser/+bug/1072556/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp