** Description changed:

  I use Ubuntu 20.10 with hplip 3.20.5+dfsg0-3build1.  The AiO fax is
  physically attached to the router via the fax cable and via the Ethernet
  cable, and my Ubuntu machine communicates with the router through WiFi.
- Printing works, but not faxing (except by making the AiO machine
- physically scan the paper, but this way has nothing to do with Ubuntu).
- I tried several ways of sending a two-page PDF through a fax, in
- particular several ways of choosing the fax driver and the device URI,
- but, never mind what I did, the fax did not get sent.  For example, the
- recent attempt put
+ Printing from Ubuntu works, faxing directly with the AiO machine also
+ works, but NOT faxing from Ubuntu. I tried several ways of sending a
+ two-page PDF through a fax, in particular several ways of choosing the
+ fax driver and the device URI, but, never mind what I did, the fax did
+ not get sent.  For example, the recent attempt put
  
  [14447.505158] audit: type=1400 audit(1605916929.875:51):
  apparmor="DENIED" operation="open" profile="/usr/lib/cups/backend/cups-
  pdf" name="/etc/cups/" pid=11678 comm="cups-pdf" requested_mask="r"
  denied_mask="r" fsuid=0 ouid=0
  
  into the syslog.  Is it a bug?  Perhaps.  Does it have anything to do
  with faxing?  Perhaps, no idea.  Some of my faxing attempts ended with
  the "abgebrochen" status, others with "Die Druckerkonfiguration ist
  nicht korrekt oder der Drucker existiert nicht mehr." status, yet others
  with "Device communication error" accompanied by Code 5012 and "Please
  correct the problem and try again".  Yet another attempt ended with
  "FileNotFoundError: [Errno 2] No such file or directory:
  \'/home/my_username/.hplip/hp_fax-pipe-146\'" deep in
  /var/log/cups/error_log .
  
  I guess, my main point of criticism is that it's nowhere clearly written, in 
a step-by-step way, how to send a fax, what to expect at each step, and how to 
troubleshoot if the expected thing does not happen.  For example, 
https://developers.hp.com/hp-linux-imaging-and-printing/howtos/faxing mentions 
the "Items" tab, but on my machine, there is no such tab in hp-sendfax or 
hp-toolbox.   The description on https://wiki.ubuntuusers.de/HPLIP/#Faxen is 
equivalent to empty.  Yes, I did run hp-sendfax -pENVY_Photo_7800_fax 
-fTargetFaxNumber
  (where the TargetFaxNumber is 03212... in my country).
  
  In short, how on earth do I send my PDFs to the fax?

** Description changed:

  I use Ubuntu 20.10 with hplip 3.20.5+dfsg0-3build1.  The AiO fax is
  physically attached to the router via the fax cable and via the Ethernet
  cable, and my Ubuntu machine communicates with the router through WiFi.
  Printing from Ubuntu works, faxing directly with the AiO machine also
  works, but NOT faxing from Ubuntu. I tried several ways of sending a
  two-page PDF through a fax, in particular several ways of choosing the
  fax driver and the device URI, but, never mind what I did, the fax did
  not get sent.  For example, the recent attempt put
  
  [14447.505158] audit: type=1400 audit(1605916929.875:51):
  apparmor="DENIED" operation="open" profile="/usr/lib/cups/backend/cups-
  pdf" name="/etc/cups/" pid=11678 comm="cups-pdf" requested_mask="r"
  denied_mask="r" fsuid=0 ouid=0
  
  into the syslog.  Is it a bug?  Perhaps.  Does it have anything to do
  with faxing?  Perhaps, no idea.  Some of my faxing attempts ended with
  the "abgebrochen" status, others with "Die Druckerkonfiguration ist
  nicht korrekt oder der Drucker existiert nicht mehr." status, yet others
  with "Device communication error" accompanied by Code 5012 and "Please
  correct the problem and try again".  Yet another attempt ended with
  "FileNotFoundError: [Errno 2] No such file or directory:
  \'/home/my_username/.hplip/hp_fax-pipe-146\'" deep in
  /var/log/cups/error_log .
  
  I guess, my main point of criticism is that it's nowhere clearly written, in 
a step-by-step way, how to send a fax, what to expect at each step, and how to 
troubleshoot if the expected thing does not happen.  For example, 
https://developers.hp.com/hp-linux-imaging-and-printing/howtos/faxing mentions 
the "Items" tab, but on my machine, there is no such tab in hp-sendfax or 
hp-toolbox.   The description on https://wiki.ubuntuusers.de/HPLIP/#Faxen is 
equivalent to empty.  Yes, I did run hp-sendfax -pENVY_Photo_7800_fax 
-fTargetFaxNumber
  (where the TargetFaxNumber is 03212... in my country).
  
- In short, how on earth do I send my PDFs to the fax?
+ In short, how on earth do I fax my PDFs from Ubuntu through HP Envy
+ Photo 7800 All-in-One?

** Description changed:

  I use Ubuntu 20.10 with hplip 3.20.5+dfsg0-3build1.  The AiO fax is
  physically attached to the router via the fax cable and via the Ethernet
  cable, and my Ubuntu machine communicates with the router through WiFi.
  Printing from Ubuntu works, faxing directly with the AiO machine also
  works, but NOT faxing from Ubuntu. I tried several ways of sending a
  two-page PDF through a fax, in particular several ways of choosing the
  fax driver and the device URI, but, never mind what I did, the fax did
  not get sent.  For example, the recent attempt put
  
  [14447.505158] audit: type=1400 audit(1605916929.875:51):
  apparmor="DENIED" operation="open" profile="/usr/lib/cups/backend/cups-
  pdf" name="/etc/cups/" pid=11678 comm="cups-pdf" requested_mask="r"
  denied_mask="r" fsuid=0 ouid=0
  
  into the syslog.  Is it a bug?  Perhaps.  Does it have anything to do
  with faxing?  Perhaps, no idea.  Some of my faxing attempts ended with
  the "abgebrochen" status, others with "Die Druckerkonfiguration ist
  nicht korrekt oder der Drucker existiert nicht mehr." status, yet others
  with "Device communication error" accompanied by Code 5012 and "Please
  correct the problem and try again".  Yet another attempt ended with
  "FileNotFoundError: [Errno 2] No such file or directory:
  \'/home/my_username/.hplip/hp_fax-pipe-146\'" deep in
  /var/log/cups/error_log .
  
- I guess, my main point of criticism is that it's nowhere clearly written, in 
a step-by-step way, how to send a fax, what to expect at each step, and how to 
troubleshoot if the expected thing does not happen.  For example, 
https://developers.hp.com/hp-linux-imaging-and-printing/howtos/faxing mentions 
the "Items" tab, but on my machine, there is no such tab in hp-sendfax or 
hp-toolbox.   The description on https://wiki.ubuntuusers.de/HPLIP/#Faxen is 
equivalent to empty.  Yes, I did run hp-sendfax -pENVY_Photo_7800_fax 
-fTargetFaxNumber
+ I guess, my main point of criticism is that it's nowhere clearly written, in 
a step-by-step way, how to send a fax, what to expect at each step, and what or 
how to troubleshoot if the expected thing does not happen.  For example, 
https://developers.hp.com/hp-linux-imaging-and-printing/howtos/faxing mentions 
the "Items" tab, but on my machine, there is no such tab in hp-sendfax or 
hp-toolbox.   The description on https://wiki.ubuntuusers.de/HPLIP/#Faxen is 
equivalent to empty.  Yes, I did run hp-sendfax -pENVY_Photo_7800_fax 
-fTargetFaxNumber
  (where the TargetFaxNumber is 03212... in my country).
  
  In short, how on earth do I fax my PDFs from Ubuntu through HP Envy
  Photo 7800 All-in-One?

** Description changed:

  I use Ubuntu 20.10 with hplip 3.20.5+dfsg0-3build1.  The AiO fax is
  physically attached to the router via the fax cable and via the Ethernet
  cable, and my Ubuntu machine communicates with the router through WiFi.
  Printing from Ubuntu works, faxing directly with the AiO machine also
  works, but NOT faxing from Ubuntu. I tried several ways of sending a
  two-page PDF through a fax, in particular several ways of choosing the
  fax driver and the device URI, but, never mind what I did, the fax did
  not get sent.  For example, the recent attempt put
  
  [14447.505158] audit: type=1400 audit(1605916929.875:51):
  apparmor="DENIED" operation="open" profile="/usr/lib/cups/backend/cups-
  pdf" name="/etc/cups/" pid=11678 comm="cups-pdf" requested_mask="r"
  denied_mask="r" fsuid=0 ouid=0
  
- into the syslog.  Is it a bug?  Perhaps.  Does it have anything to do
- with faxing?  Perhaps, no idea.  Some of my faxing attempts ended with
- the "abgebrochen" status, others with "Die Druckerkonfiguration ist
+ into the syslog.  Is it a bug?  Very likely.  Does it have anything to
+ do with faxing?  Perhaps, no idea.  Some of my faxing attempts ended
+ with the "abgebrochen" status, others with "Die Druckerkonfiguration ist
  nicht korrekt oder der Drucker existiert nicht mehr." status, yet others
  with "Device communication error" accompanied by Code 5012 and "Please
  correct the problem and try again".  Yet another attempt ended with
  "FileNotFoundError: [Errno 2] No such file or directory:
  \'/home/my_username/.hplip/hp_fax-pipe-146\'" deep in
  /var/log/cups/error_log .
  
+ All of these are probably bugs of some kind which probably have
+ something to do with faxing, directly or indirectly.
+ 
  I guess, my main point of criticism is that it's nowhere clearly written, in 
a step-by-step way, how to send a fax, what to expect at each step, and what or 
how to troubleshoot if the expected thing does not happen.  For example, 
https://developers.hp.com/hp-linux-imaging-and-printing/howtos/faxing mentions 
the "Items" tab, but on my machine, there is no such tab in hp-sendfax or 
hp-toolbox.   The description on https://wiki.ubuntuusers.de/HPLIP/#Faxen is 
equivalent to empty.  Yes, I did run hp-sendfax -pENVY_Photo_7800_fax 
-fTargetFaxNumber
  (where the TargetFaxNumber is 03212... in my country).
  
  In short, how on earth do I fax my PDFs from Ubuntu through HP Envy
  Photo 7800 All-in-One?

** Description changed:

  I use Ubuntu 20.10 with hplip 3.20.5+dfsg0-3build1.  The AiO fax is
  physically attached to the router via the fax cable and via the Ethernet
  cable, and my Ubuntu machine communicates with the router through WiFi.
  Printing from Ubuntu works, faxing directly with the AiO machine also
  works, but NOT faxing from Ubuntu. I tried several ways of sending a
  two-page PDF through a fax, in particular several ways of choosing the
  fax driver and the device URI, but, never mind what I did, the fax did
  not get sent.  For example, the recent attempt put
  
  [14447.505158] audit: type=1400 audit(1605916929.875:51):
  apparmor="DENIED" operation="open" profile="/usr/lib/cups/backend/cups-
  pdf" name="/etc/cups/" pid=11678 comm="cups-pdf" requested_mask="r"
  denied_mask="r" fsuid=0 ouid=0
  
  into the syslog.  Is it a bug?  Very likely.  Does it have anything to
  do with faxing?  Perhaps, no idea.  Some of my faxing attempts ended
  with the "abgebrochen" status, others with "Die Druckerkonfiguration ist
  nicht korrekt oder der Drucker existiert nicht mehr." status, yet others
  with "Device communication error" accompanied by Code 5012 and "Please
  correct the problem and try again".  Yet another attempt ended with
  "FileNotFoundError: [Errno 2] No such file or directory:
  \'/home/my_username/.hplip/hp_fax-pipe-146\'" deep in
  /var/log/cups/error_log .
  
- All of these are probably bugs of some kind which probably have
+ All of these are probably bugs of various kinds which probably have
  something to do with faxing, directly or indirectly.
  
  I guess, my main point of criticism is that it's nowhere clearly written, in 
a step-by-step way, how to send a fax, what to expect at each step, and what or 
how to troubleshoot if the expected thing does not happen.  For example, 
https://developers.hp.com/hp-linux-imaging-and-printing/howtos/faxing mentions 
the "Items" tab, but on my machine, there is no such tab in hp-sendfax or 
hp-toolbox.   The description on https://wiki.ubuntuusers.de/HPLIP/#Faxen is 
equivalent to empty.  Yes, I did run hp-sendfax -pENVY_Photo_7800_fax 
-fTargetFaxNumber
  (where the TargetFaxNumber is 03212... in my country).
  
  In short, how on earth do I fax my PDFs from Ubuntu through HP Envy
  Photo 7800 All-in-One?

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https://bugs.launchpad.net/bugs/1905108

Title:
  Cannot fax with HP Envy Photo 7800 All-in-One

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