I want to remind everyone subscribed to this bug to please test the
fixed package and verify it.

If you get an error during the installation process (see bug 1642966),
please run the commands

sudo service cups stop
sudo apt-get install -f
sudo service cups start

in a terminal window to complete the installation (see also comment #5
in bug 1642966). Then test whether this bug is fixed.

To the SRU team: Bug 1642966 cannot be caused by the fix for this bug.
The fix is a trivial change in the scheduler, see the debdiff attched to
comment #20 of this bug. Bug 1642966 is probably caused by some
coincidence which had also broken any other update of the cups package.

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https://bugs.launchpad.net/bugs/1598300

Title:
  CUPS web interface stops responding after a while

Status in cups package in Ubuntu:
  Fix Released
Status in cups source package in Xenial:
  Fix Committed

Bug description:
  after 6 minutes or so, cups is not responding.
  it do not produce error on the log, just stop working, worse, it exit with 0

  
⌌—————————————————————————————————————————————————————————————————————————————————————⌍
  |root@cupsmachine :~# systemctl status cups                                   
        |
  |● cups.service - CUPS Scheduler                                              
        |
  |   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: 
enabled)|
  |   Active: inactive (dead) since ven. 2016-07-01 10:31:32 TAHT; 2min 16s ago 
        |
  |     Docs: man:cupsd(8)                                                      
        |
  |  Process: 28686 ExecStart=/usr/sbin/cupsd -l (code=exited, 
status=0/SUCCESS)        |
  | Main PID: 28686 (code=exited, status=0/SUCCESS)                             
        |
  |                                                                             
        |
  |juil. 01 10:30:01 appli-client systemd[1]: Started CUPS Scheduler.           
        |
  
⌎—————————————————————————————————————————————————————————————————————————————————————⌏

  I got to launch it again, so I have finish with a cron job like
  */10 * * * * systemctl status cups.service|grep -q 'inactive (dead)' && 
systemctl start cups

  but it is a dirty solution. I have no idea of what make it stop.
  NB: I have seen problems related to apparmor, this machine has no apparmor 
package.

  [Impact]

  If you want to use the CUPS web interface in Xenial and therefore set
  "WebInterface Yes" in /etc/cups/cupsd.conf, CUPS could auto-shutdown
  when it is idle and then an attempt to access http://localhost:631/
  via a web browser fails. People get confused as other access to CUPS

  [Testcase]

  Take a CUPS setup on Xenial with no shared print queues and CUPS only
  listening on the domain socket. Activate the web interface via

  cupsctl WebInterface=Yes

  Now you are able to access the web interface via
  http://localhost:631/. Wait for some minutes without accessing CUPS
  until the CUPS daemon shuts down automatically. Try to open the web
  interface again and it will not work.

  With the fixed CUPS package CUPS will not auto-shutdown when the web
  interface is activated.

  [Regression Potential]

  Low, as we are removing a simple distro patch to get back to the
  original, upstream behavior.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1598300/+subscriptions

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