cannot create a username containing dot in ubuntu 13.10 64bit

[Luca Borrione]

It happened to me to try to create a username containing a dot such as name.surname on ubuntu 13.10

According to the "Users and Groups" tool (gnome-system-tool):
Username must consists of:
> lower case letters from the English alphabet
> digits
> any of the characters ".", "-" and "_"

but trying to add a username like name.surname using that tool you will get an error window saying:
"The configuration could not be saved"
"an unknown error occurred"

Opening a terminal and typing
sudo useradd name.surname
sudo passwd name.surname

actually seems to work, but then the brand new user results to be completely NOT usable:

- switching user selecting the new user from the top-right ubuntu icon on the top bar will lead to have a black screen

- hard-rebooting and trying to select the new user will lead to be trapped in a loop: you insert the password onto the login tool, it seems to be loading the new user while after a while it gives again the login tool window and you can keep on inserting the password forever. At this point selecting a different user previously created without a dot will work as normal instead.

uname -a
Linux ubook- 3.11.0-18-generic #32-Ubuntu SMP Tue Feb 18 21:11:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1301404/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Sebastien Bacher (seb128)]

reassigning to gnome-control-center, unity-control-center doesn't exist in 13.10