Public bug reported:

Since upgrading this machine to yakkety I've seen periodic hangs during
booting. If I wait long enough systemd give up and drops to maintenance
mode. Looking in the journal I see events like this:

Sep 19 08:24:22 ubuntu-xps13 systemd[1]: dev-disk-by\x2duuid-
63cd6483\x2ddf95\x2d4426\x2d916e\x2d8c28becbfd8f.device: Job dev-disk-by
timed out.

Searching on the internet indicates that this happen if devices reported
by udev don't have the "systemd" tag, and I find that they do not have
the tag when the boot times out but they do have the tag when boot does
not time out.

This happens once for every 3 or 4 boots and with both 4.4 and 4.8
kernels. I'm attaching the output of 'journalctl -xb' and 'udevadm info
--export-db' from a timed-out boot.

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: udev 231-6
ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
Uname: Linux 4.8.0-11-generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Sep 19 09:27:08 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-02-19 (577 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150110)
MachineType: Dell Inc. XPS 13 9343
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-11-generic 
root=UUID=bdad03f3-06c0-439d-8869-32fad0b1851b ro quiet splash
SourcePackage: systemd
UpgradeStatus: Upgraded to yakkety on 2016-01-08 (254 days ago) 05/15/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04 0TM99H
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvrA04:bd05/15/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr: XPS 13 9343
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug yakkety

** Attachment added: "Output of 'journalctl -xb'"

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  udev sometimes doesn't apply systemd tag to devices

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