$ROOTCMD rm -f /etc/udev/kernel-upgrade
fi
-echo "Updating package list"
-$ROOTCMD apt-get update
+set +u
+if ifclass RELEASE ; then
+set -u
+ echo "Not updating package list as RELEASE class is set."
+else
+ echo "Updating package list"
+ $ROOTCMD apt-get update
+fi
echo "Cleaning apt places"
$ROOTCMD apt-get check 2>/dev/null