@@ -372,7 +372,7 @@ do_install() {

 			# aufs is preferred over devicemapper; try to ensure the driver is available.

 			if ! grep -q aufs /proc/filesystems && ! $sh_c 'modprobe aufs'; then

-				if uname -r | grep -q -- '-generic' && dpkg -l 'linux-image-*-generic' | egrep '^ii|^hi' 2>/dev/null; then

+				if uname -r | grep -q -- '-generic' && dpkg -l 'linux-image-*-generic' | grep -qE '^ii|^hi' 2>/dev/null; then

 					kern_extras="linux-image-extra-$(uname -r) linux-image-extra-virtual"

 					apt_get_update