Add '-a' after gpasswd to add USER to group plugdev.
Per: ➜ gpasswd --help
Usage: gpasswd [option] GROUP
Options:
-a, --add USER add USER to GROUP
-d, --delete USER remove USER from GROUP
-h, --help display this help message and exit
-Q, --root CHROOT_DIR directory to chroot into
-r, --remove-password remove the GROUP's password
-R, --restrict restrict access to GROUP to its members
-M, --members USER,... set the list of members of GROUP
-A, --administrators ADMIN,...
set the list of administrators for GROUP
Except for the -A and -M options, the options cannot be combined.
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