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Make sure your user name is a member of the plugdev and cdrom groups. To find out if you are, run the command groups as a normal user. It will output the groups you are a member of.
excerpt from 'man usermod';
-g initial_group
The group name or number of the user's new initial login group.
The group name must exist. A group number must refer to an
already existing group. The default group number is 1.
-G group,[...]
A list of supplementary groups which the user is also a member
of. Each group is separated from the next by a comma, with no
intervening whitespace. The groups are subject to the same
restrictions as the group given with the -g option. If the user
is currently a member of a group which is not listed, the user
will be removed from the group
Code:
excerpt from 'man groups';
NAME
groups - display current group names
SYNOPSIS
groups [user]
DESCRIPTION
groups displays the current group names or ID values. If the value does
not have a corresponding entry in /etc/group, the value will be dis-
played as the numerical group value. The optional user parameter will
display the groups for the named user.
NOTE
Systems which do not support concurrent group sets will have the infor-
mation from /etc/group reported. The user must use newgrp or sg to
change their current real and effective group ID.
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