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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Thanks. So this keeps looping on

apr 09 01:41:57 hostname kernel: usb 1-3: new high-speed USB device number 2 using xhci_hcd
apr 09 01:41:57 hostname kernel: usb 1-3: device descriptor read/all, error -110

but doesn't say which kind of device that is as it can't talk to it.

Is this a regression in 15.04? You have upgraded this machine for a long
time, so you might still have some older kernels around (from 14.04 LTS
or 14.10). You might try booting those from the GRUB boot menu and see
if that helps?

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1437492

Title:
  boot stalls on USB detection errors

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My system boots slow. I investigated this and it seems systemd-udev-settle.service is the culprit.
  My system runs ext4 with GPT on UEFI.
  I do not use encryption or LVM.

  $ journalctl -u systemd-udev-settle
  -- Logs begin at fri 2015-03-27 19:03:06 CET, end at fri 2015-03-27 22:06:32 CET. --
  mar 27 19:03:42 hostname systemd[1]: Started udev Wait for Complete Device Initialization.

  $ systemd-analyze
  Startup finished in 14.865s (firmware) + 11.133s (loader) + 6.127s (kernel) + 42.079s (userspace) = 1min 14.206s

  $ systemd-analyze critical-chain
  http://paste.ubuntu.com/10691416/

  $ systemd-analyze blame
  36.013s systemd-udev-settle.service
  http://paste.ubuntu.com/10691314/

  $ systemctl show systemd-udev-settle.service -p RequiredBy
  RequiredBy=

  $ systemctl show systemd-udev-settle.service -p WantedBy
  WantedBy=friendly-recovery.service

  $ systemd-analyze plot > boot.svg
  http://imgh.us/boot_1.svg

  $ systemd-analyze dump
  http://paste.ubuntu.com/10691856/

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-5ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  ApportVersion: 2.16.2-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Fri Mar 27 22:05:28 2015
  InstallationDate: Installed on 2013-12-26 (455 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: ASUS All Series
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-10-generic.efi.signed root=UUID=31dc4488-28d4-4d2a-aa51-6733e237d5f8 ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/18/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2103
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z87-PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2103:bd08/18/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ87-PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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