can't add user containing "." in the name

Asked by Jon Poole on 2012-04-17

Using Ubuntu updated to the latest version 2 days ago with Apache2 as a web server and want to create users with names relating to domain names such as "".

The GUI users and groups panel appears to show that incorporating a full stop in the name is acceptable, but won't actually do it. Trying to add the names without the dots works fine.

Any ideas?

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Ubuntu lightdm Edit question
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Jon Poole (kv0) said : #2

Thanks, but that doesn't answer why the GUI panel directly tells me that they are valid characters, but then won't accept them.

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