ubuntu 14.04にアップグレードした後、dmesgでこれが表示されます
[ 1.538887] systemd-udevd[105]: starting version 204
[ 19.074098] systemd-udevd[310]: starting version 204
[ 19.271342] systemd-udevd[381]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory
[ 19.279385] systemd-udevd[395]: failed to execute '/lib/udev/socket:@/org/freedesktop/hal/udev_event' 'socket:@/org/freedesktop/hal/udev_event': No such file or directory
[...]
どうすれば修正できますか?