slow shutdown on Ubuntu 16.04, don't how to diagnose

Asked by jiacheng yuan on 2019-01-26

Hi
I'm using Ubuntu 16.04 with kernel 4.15 on my recently purchased laptop. The system has been suffering from slow shutdown (more than 2 minutes) but I don't know how to diagnose the problem.

I found some post on this issue and disabled cups by
sudo systemctl disable cups-browsed.service
I worked for only a while but now it's back to previous status.

jc@jc-XPS-15:~$ uname -a
Linux jc-XPS-15 4.15.0-43-generic #46~16.04.1-Ubuntu SMP Fri Dec 7 13:31:08 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
jc@jc-XPS-15:~$ lsb_release -crid
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial

Really appreciate it if someone can tell me how to diagnose this issue and how to solve it. I'm new to ubuntu. Thanks in advance!

Question information

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Ubuntu software-center Edit question
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Last query:
2019-01-26
Last reply:
2019-01-31

Do you use a printer?

jiacheng yuan (kracon7) said : #2

Yes I am. It's a printer on the network.

jiacheng yuan (kracon7) said : #4

Actually I already tried the methods metioned in the website you shared. Changing the timeout only make it worse. So I have to restore my system back to the point before I changed the timeout.

Is there any way to see which process is hanging during shutdown?

I think cups service is already disabled

jc@jc-XPS-15:~$ sudo systemctl status cups-browsed
‚óŹ cups-browsed.service - Make remote CUPS printers available locally
   Loaded: loaded (/lib/systemd/system/cups-browsed.service; disabled; vendor pr
   Active: inactive (dead)

jiacheng yuan (kracon7) said : #5

Okay I found some clue in my /var/log/syslog

This is the log when system hang during reboot. From 23:40:58 to 23:42:36

Jan 30 23:40:58 jc-XPS-15 systemd[1]: Stopping User Manager for UID 108...
Jan 30 23:40:58 jc-XPS-15 systemd[1]: Stopping Authenticate and Authorize Users to Run Privileged Tasks...
Jan 30 23:40:58 jc-XPS-15 systemd[1]: Stopping ACPI event daemon...
Jan 30 23:40:58 jc-XPS-15 systemd[1]: Stopping Save/Restore Sound Card State...
Jan 30 23:40:58 jc-XPS-15 systemd[1178]: Stopped target Default.
Jan 30 23:40:58 jc-XPS-15 systemd[1178]: Reached target Shutdown.
Jan 30 23:40:58 jc-XPS-15 systemd[1]: Stopping Manage, Install and Generate Color Profiles...
Jan 30 23:40:58 jc-XPS-15 systemd[1]: Stopped target Timers.
Jan 30 23:40:58 jc-XPS-15 systemd[1]: Closed Load/Save RF Kill Switch Status /dev/rfkill Watch.
Jan 30 23:40:58 jc-XPS-15 systemd[1178]: Starting Exit the Session...
Jan 30 23:40:58 jc-XPS-15 systemd[1178]: Stopped target Basic System.
Jan 30 23:40:58 jc-XPS-15 systemd[1178]: Stopped target Paths.
Jan 30 23:40:58 jc-XPS-15 systemd[1178]: Stopped target Timers.
Jan 30 23:40:58 jc-XPS-15 rsyslogd: [origin software="rsyslogd" swVersion="8.16.0" x-pid="831" x-info="http://www.rsyslog.com"] exiting on signal 15.
Jan 30 23:42:36 jc-XPS-15 rsyslogd: [origin software="rsyslogd" swVersion="8.16.0" x-pid="845" x-info="http://www.rsyslog.com"] start
Jan 30 23:42:36 jc-XPS-15 systemd-modules-load[363]: Inserted module 'lp'
Jan 30 23:42:36 jc-XPS-15 systemd-modules-load[363]: Inserted module 'ppdev'
Jan 30 23:42:36 jc-XPS-15 systemd-modules-load[363]: Inserted module 'parport_pc'
Jan 30 23:42:36 jc-XPS-15 systemd[1]: Starting Flush Journal to Persistent Storage...
Jan 30 23:42:36 jc-XPS-15 rsyslogd-2222: command 'KLogPermitNonKernelFacility' is currently not permitted - did you already set it via a RainerScript command (v6+ config)? [v8.16.0 try http://www.rsyslog.com/e/2222 ]
Jan 30 23:42:36 jc-XPS-15 systemd[1]: Starting udev Kernel Device Manager...
Jan 30 23:42:36 jc-XPS-15 rsyslogd: rsyslogd's groupid changed to 108
Jan 30 23:42:36 jc-XPS-15 rsyslogd: rsyslogd's userid changed to 104
Jan 30 23:42:36 jc-XPS-15 loadkeys[358]: Loading /etc/console-setup/cached.kmap.gz
Jan 30 23:42:36 jc-XPS-15 systemd[1]: Started Set console keymap.
Jan 30 23:42:36 jc-XPS-15 systemd[1]: Reached target Local File Systems (Pre).
Jan 30 23:42:36 jc-XPS-15 systemd[1]: Started Flush Journal to Persistent Storage.

Seems to be syslog slowing things down.

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