systemd crashed with SIGABRT when shutting down

[François Rey]

Installed 16.04 daily build on my Dell XPS 12 (9250), system up to date when this happened.
When my new SATA to USB Type-C (Thunderbolt) adapter is plugged, shutting down the computer freezes on the Ubuntu... splash.
Even if I boot with everything plugged in it still happens.
Overall only the USB Type C (Thunderbolt) to USB3 adapter worked for me, but only if booted while plugged in, hot plugin not working.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: systemd 229-2ubuntu1 [modified: usr/share/dbus-1/system-services/org.freedesktop.systemd1.service]
ProcVersionSignature: Ubuntu 4.4.0-12.28-generic 4.4.4
Uname: Linux 4.4.0-12-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Sat Mar 12 19:38:37 2016
ExecutablePath: /lib/systemd/systemd
InstallationDate: Installed on 2016-02-27 (14 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160226)
MachineType: Dell Inc. XPS 12 9250
ProcCmdline: /lib/systemd/systemd --user
ProcEnviron:
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-12-generic.efi.signed root=UUID=5dd0bb11-5f5b-448e-886f-13658e54059f ro quiet splash vt.handoff=7
Signal: 6
SourcePackage: systemd
StacktraceTop:
 ?? ()
 ?? ()
 ?? ()
 ?? ()
 ?? ()
SystemdDelta:
 [EXTENDED] /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
 [EXTENDED] /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
 [EXTENDED] /etc/systemd/system/display-manager.service → /lib/systemd/system/display-manager.service.d/xdiagnose.conf

 3 overridden configuration files found.
SystemdFailedUnits: Error: command ['systemctl', 'status', '--full', 'Error:'] failed with exit code 1: Failed to get properties: Failed to activate service 'org.freedesktop.systemd1': timed out
Title: systemd crashed with SIGABRT
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 01/20/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 01.01.06
dmi.board.name: 0XYRGN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr01.01.06:bd01/20/2016:svnDellInc.:pnXPS129250:pvr:rvnDellInc.:rn0XYRGN:rvrA00:cvnDellInc.:ct8:cvr:
dmi.product.name: XPS 12 9250
dmi.sys.vendor: Dell Inc.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1547851, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.