Incidentally, Jesús, that *is* checked. The code contains:
if ! LC_ALL=C expr "$USER" : '[a-z][-a-z0-9]*$'
>/dev/null; then
(expr implicitly prepends a ^ to the regex) and in my tests I got an
error properly displayed when trying to select a username containing
spaces or symbols. So, if you file a bug about this, I'll need
specifics.
--
crashes if reserved username is selected
https://launchpad.net/bugs/47861
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