Ugyan Fedora 25-ön nézem, 4.9.13-as kernelem van, 2.2.0-ás cups, de ezt látom az /etc/cups/cups-files.conf file-ban:
# Default user and group for filters/backends/helper programs; this cannot be
# any user or group that resolves to ID 0 for security reasons...
#User lp
#Group lp
tr '[:lower:]' '[:upper:]' <<<locsemege
LOCSEMEGE