I come from just trying to document the same bug (I searched first to check something similar but did not find it)
The GUI to add a user in Ubuntu allows a username beginning with a number (checked appears ok but call to user creation fails). The reason is that the called Perl script adduser does not accept it. This script is configurable in /etc/adduser.conf: # check user and group names also against this regular expression. #NAME_REGEX="^[a-z][-a-z0-9_]*\$" As it is commented out, (same) value is taken from /usr/share/perl5/Debian/AdduserCommon.pm: $configref->{"name_regex"} = "^[a-z][-a-z0-9_]*\$"; To solve this, you could: - validate only names matching the expression. - modify /etc/adduser.conf with another NAME_REGEX to fit Ubuntu's policies (in this case, adduser would be affected, too). Added to this, in a root terminal, adduser/passwd allow any password. This GUI limits this possibility (for security matters, that is ok, but IMHO user creating an account from GUI should behave "like root"). ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-control-center 1:3.28.2-0ubuntu0.18.04.6 ProcVersionSignature: Ubuntu 5.3.0-42.34~18.04.1-generic 5.3.18 Uname: Linux 5.3.0-42-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.12 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri Apr 24 11:59:24 2020 ExecutablePath: /usr/bin/gnome-control-center InstallationDate: Installed on 2020-03-10 (45 days ago) InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1) SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1630417 Title: the control center chokes on initial number in user name To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1630417/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs