Connection to HP ENVY 4500 wireless printer failed after upgrade 14.10 -> 15.04

Question

Tried first the following:

Hardware > Printers says

Printer service not available. Start the service...

However, Start Service - button is greyed, only Connect - button usable, "Not connected" on lower left corner of dialog.

Tried then Connect > Connect to CUPS server (localhost)

CUPS server error, failed to connect to server

Checked via Terminal, if cups processes are there :

 $ ps -ef|grep cups  
 root 796     1  0 08:36 ?  00:00:01 /usr/sbin/cups-browsed  
 root 2673    1  0 09:09 ?  00:00:00  /usr/sbin/cupsd -l
 lp   2679 2673  0 09:09 ?  00:00:00 /usr/lib/cups/notifier/dbus dbus://

Then tried HPLIP Toolbox:

HP Device manager says

No Installed HP devices found

Used Setup device - button, did Manual Discovery > Next, and printer was discovered. Clicked Next, on textbox

PPD File Not found, click browse...

Browsed and found Downloads/ppd/hpcups/hp-envy_4500_series.ppd, used it and clicked Add printer

Printer queue setup failed, Error: unable to connect to CUPS server

Any ideas, please ?

Additional details :

• The problem occurs after each boot. If I then kill the cupsd and start it again with sudo and with same parameters = sudo /usr/sbin/cupsd -l & , printer will be visible again, but only to next boot, below is what I actually do to get this temporary solution:

  xxxxx@D830:~$ ps -ef|grep cupsd  
  root       700     1  0 15:30 ?        00:00:00 /usr/sbin/cupsd -l  
  xxxxx     2432  2311  0 15:33 pts/0    00:00:00 grep --color=auto cupsd  
  xxxxx@D830:~$ sudo kill 700  
  [sudo] password for xxxxx:   
  xxxxx@D830:~$ sudo /usr/sbin/cupsd -l &  
  [1] 2442  
  xxxxx@D830:~$ ps -ef|grep cupsd  
  root      2442  2311  0 15:34 pts/0    00:00:00 sudo /usr/sbin/cupsd -l  
  root      2443  2442  0 15:34 pts/0    00:00:00 /usr/sbin/cupsd -l  
  xxxxx     2446  2311  0 15:34 pts/0    00:00:00 grep --color=auto cupsd  
  

For A.B. Open a browser and use this URL: localhost:631. What happens?

• "Firefox can't establish a connection to the server at localhost:631"

For A.B. Post the output of this command in your question:

grep cups /var/log/syslog*  
Apr 29 15:30:08 D830 ureadahead[202]: ureadahead:/var/spool/cups/tmp/cups-dbus-notifier-lockfile: No such file or directory  

(This is the only row in syslog after boot)

Answer 1

• Open a terminal and execute sudo service cups restart
• Turning on the printer
• Open the location localhost:631 in your browser
• Click Administration and Add Printer
• Wait a second, your printer should be listed
• Select your printer and Continue
• Continue again
• Click the button behind Or Provide a PPD File
• Select your PPD file and click Add printer