I hit this problem as well, booting on my system hangs for three minutes waiting for udev to settle. I have a HP keyboard.
Booting without the keyboard plugged in, or removing the hplip package solves the problem. hplip version 3.15.2-0ubuntu4.1 $ lsusb Bus 001 Device 002: ID 03f0:0024 Hewlett-Packard KU-0316 Keyboard $ sudo systemd-analyze blame 3min 40ms systemd-udev-settle.service $ journalctl | grep -i udev Jun 25 14:19:32 test-MSH87TN-00 systemd-udevd[265]: worker [283] /devices/pci0000:00/0000:00:14.0/usb1/1-1 is taking a long time Jun 25 14:19:32 test-MSH87TN-00 systemd-udevd[265]: worker [285] /devices/pci0000:00/0000:00:14.0/usb1/1-3 is taking a long time Jun 25 14:21:32 test-MSH87TN-00 systemd[1]: systemd-udev-settle.service start operation timed out. Terminating. Jun 25 14:21:32 test-MSH87TN-00 systemd[1]: Failed to start udev Wait for Complete Device Initialization. Jun 25 14:21:32 test-MSH87TN-00 systemd[1]: Unit systemd-udev-settle.service entered failed state. Jun 25 14:21:32 test-MSH87TN-00 systemd[1]: systemd-udev-settle.service failed. Jun 25 14:21:33 test-MSH87TN-00 systemd-udevd[283]: timeout '/bin/sh -c 'if [ -f /usr/bin/systemctl ]; then /usr/bin/systemctl --no-block start hplip-printer@001:002.service; else /usr/bin/nohup /usr/bin/hp-config_usb_printer 001:002 ; fi &'' Jun 25 14:21:33 test-MSH87TN-00 systemd-udevd[283]: timeout '/bin/sh -c 'grep -q ^#hpaio /etc/sane.d/dll.conf;if [ $? -eq 0 ];then sed -i -e s/^#hpaio/hpaio/ /etc/sane.d/dll.conf;else grep -q ^hpaio /etc/sane.d/dll.conf;if [ $? -ne 0 ];then echo hpaio >>/etc/sane.d/dll.conf;fi;fi'' Jun 25 14:21:33 test-MSH87TN-00 systemd-udevd[283]: slow: '/bin/sh -c 'grep -q ^#hpaio /etc/sane.d/dll.conf;if [ $? -eq 0 ];then sed -i -e s/^#hpaio/hpaio/ /etc/sane.d/dll.conf;else grep -q ^hpaio /etc/sane.d/dll.conf;if [ $? -ne 0 ];then echo hpaio >>/etc/sane.d/dll.conf;fi;fi'' [1011] Jun 25 14:21:33 test-MSH87TN-00 systemd-udevd[285]: timeout '/bin/sh -c 'if [ -f /usr/bin/systemctl ]; then /usr/bin/systemctl --no-block start hplip-printer@001:003.service; else /usr/bin/nohup /usr/bin/hp-config_usb_printer 001:003 ; fi &'' Jun 25 14:21:33 test-MSH87TN-00 systemd-udevd[285]: timeout '/bin/sh -c 'grep -q ^#hpaio /etc/sane.d/dll.conf;if [ $? -eq 0 ];then sed -i -e s/^#hpaio/hpaio/ /etc/sane.d/dll.conf;else grep -q ^hpaio /etc/sane.d/dll.conf;if [ $? -ne 0 ];then echo hpaio >>/etc/sane.d/dll.conf;fi;fi'' Jun 25 14:21:33 test-MSH87TN-00 systemd-udevd[285]: slow: '/bin/sh -c 'grep -q ^#hpaio /etc/sane.d/dll.conf;if [ $? -eq 0 ];then sed -i -e s/^#hpaio/hpaio/ /etc/sane.d/dll.conf;else grep -q ^hpaio /etc/sane.d/dll.conf;if [ $? -ne 0 ];then echo hpaio >>/etc/sane.d/dll.conf;fi;fi'' [1012] -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to hplip in Ubuntu. https://bugs.launchpad.net/bugs/1433557 Title: udev rules wrongly match on monitor hub, wrong invocation of systemd unit, changes config files in udev rules Status in HP Linux Imaging and Printing: Fix Released Status in hplip package in Ubuntu: Fix Released Bug description: During boot, systemd-udev-settle.service failes causing a 3min boot delay. Journal report this: > root@alice:~# journalctl -u systemd-udev-settle > -- Logs begin at Wed 2015-03-18 12:38:16 CET, end at Wed 2015-03-18 12:47:32 CET. -- > Mar 18 12:38:16 alice systemd[1]: Starting udev Wait for Complete Device Initialization... > Mar 18 12:41:16 alice systemd[1]: systemd-udev-settle.service start operation timed out. Terminating. > Mar 18 12:41:16 alice systemd[1]: Failed to start udev Wait for Complete Device Initialization. > Mar 18 12:41:16 alice systemd[1]: Unit systemd-udev-settle.service entered failed state. > Mar 18 12:41:16 alice systemd[1]: systemd-udev-settle.service failed. > Mar 18 12:41:17 alice systemd[1]: Starting udev Wait for Complete Device Initialization... > Mar 18 12:41:18 alice systemd[1]: Started udev Wait for Complete Device Initialization. The dmesg output arround that time is: > [ 8.537560] Adding 16723964k swap on /dev/sda4. Priority:-1 extents:1 across:16723964k FS > [ 9.559871] input: ST LIS3LV02DL Accelerometer as /devices/platform/lis3lv02d/input/input23 > [ 189.205551] Bluetooth: Core ver 2.20 > [ 189.205565] NET: Registered protocol family 31 ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: dbus 1.8.12-1ubuntu3 ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1 Uname: Linux 3.19.0-9-generic x86_64 NonfreeKernelModules: fglrx ApportVersion: 2.16.2-0ubuntu3 Architecture: amd64 CurrentDesktop: XFCE Date: Wed Mar 18 12:51:08 2015 SourcePackage: dbus UpgradeStatus: Upgraded to vivid on 2015-03-02 (15 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/hplip/+bug/1433557/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp