I can't quite figure out why, but the answer seems to be "occasionally".
I was able to reboot a few times (2 out of maybe 30?) using the complete
list of reboot= options. However, I suspect making the reboot= changes
is a red herring -- I rebooted the machine more in the past few hours
than I have in the rest of the time I've owned it. It's entirely
possible that I would have gotten similarly lucky had I kept trying to
reboot over and over again without making the reboot= changes.
** Changed in: systemd (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1619844
Title:
[Xenial] shutdown/reboot hangs at "Reached target Shutdown"
Status in systemd package in Ubuntu:
Confirmed
Bug description:
I tried getting more information in the debug-shell but I was
unsuccessful in doing so. I was able to switch to the debug shell via
ctrl+alt+f9 but I couldn't actually type anything in. I could switch
back to the stuck shutdown screen via ctrl+alt+f1, and hitting NumLock
would turn the light on my keyboard on and off, but I couldn't do
anything else. I captured a journal of the stuck reboot.
Interestingly, the journal shows a few more lines after "Reached
target Shutdown", which is as far as I get on my screen.
This system was installed with Xenial 16.04.1 (never been upgraded)
and has had this problem since the very first boot.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: systemd 229-4ubuntu7
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Sat Sep 3 00:33:19 2016
InstallationDate: Installed on 2016-08-17 (16 days ago)
InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
ProcEnviron:
SHELL=/bin/bash
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic.efi.signed
root=UUID=5f709fed-48c9-4830-87be-acd13f263eb1 ro
SourcePackage: systemd
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] /lib/systemd/system/mariadb.service →
/etc/systemd/system/mariadb.service.d/migrated-from-my.cnf-settings.conf
3 overridden configuration files found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/03/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: KYSKLi70.86A.0037.2016.0603.1032
dmi.board.name: NUC6i7KYB
dmi.board.vendor: Intel Corporation
dmi.board.version: H90766-404
dmi.chassis.type: 3
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrKYSKLi70.86A.0037.2016.0603.1032:bd06/03/2016:svn:pn:pvr:rvnIntelCorporation:rnNUC6i7KYB:rvrH90766-404:cvnIntelCorporation:ct3:cvr1.0:
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