I can't reproduce this is current dapper (kde-guidance 0.6.7-0ubuntu5). That is, 'cdrom' is in the secondary groups of the newly created user. I also confirmed this in /etc/group. Can you reproduce the problem on a current dapper install?
** Changed in: kde-guidance (Ubuntu)
Status: Confirmed => Needs Info
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Cannot manually add secondary groups
https://launchpad.net/bugs/37212
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