I am on Kubuntu 17.10 and I am suffering this bug. I do not have the web 
interface enabled but I have an IPP printer. I have attached the cupsd.conf on 
my system.
I think this is the relevant part of the file:

# Only listen for connections from the local machine.
Listen localhost:631
Listen /var/run/cups/cups.sock

# Show shared printers on the local network.
Browsing Off
BrowseLocalProtocols dnssd

** Attachment added: "cupsd.conf"

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  CUPS web interface stops responding after a while

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

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: 
  |   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 


  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


  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.

  [Regression in Pending SRU page]

  * Regression in autopkgtest for c2esp (armhf): test log

  This autopkgtest seems always fails :


  c2esp [xenial/armhf]

  Version       Triggers        Date    Duration        Result
  27-2  cups/2.1.3-4ubuntu0.3   2017-08-23 04:07:44 UTC         2h 50m 13s      
fail    log   artifacts   ♻
  27-2  cups/2.1.3-4ubuntu0.2   2017-08-14 23:31:50 UTC         2h 50m 11s      
fail    log   artifacts   ♻
  27-2  cups/2.1.3-4ubuntu0.2   2017-07-17 20:17:10 UTC         2h 50m 52s      
fail    log   artifacts   ♻
  27-2  cups/2.1.3-4ubuntu0.1   2017-01-20 12:00:41 UTC         2h 49m 29s      
fail    log   artifacts   ♻

  Additionally look at Till comment :

  * Regression in autopkgtest for libreoffice (i386): test log

  It's a known issue, A regression in the kernel, which breaks libreoffice with 
java enabled on i386 :

  ... so until this is fixed upstream in the kernel and backported in an
  ubuntu kernel, I'm afraid the only option is to just ignore the

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