[Bug 1663349] [NEW] Microphone doesn't work in Ubuntu build but does in mozilla.org build

[Gabriel Finkelstein]

Public bug reported:

getUserMedia doesn't ask for permission to use microphone, it simply
says "NotFoundError: The object can not be found here."

To reproduce:
1. Go to https://mozilla.github.io/webrtc-landing/gum_test.html
2. Click on the "Audio" button
Result:
Error message "NotFoundError: The object can not be found here."
Expected result:
Firefox should ask for permission to use the microphone


This happens only with the Ubuntu build of Firefox. The same version downloaded from the Mozilla website works fine and is not affected by this issue.

Using a clean profile doesn't make a difference.

The same problem happens on a different computer with different versions
of Ubuntu and Firefox.

I'm attaching an apport report just in case.

Affected Firefox version: 52.04b 64bit (52.0~b4+build1-0ubuntu0.14.04.1) installed from firefox-next PPA
Ubuntu version: Trusty (14.04.5)
Build that works fine: https://download.mozilla.org/?product=firefox-52.0b4-SSL&os=linux64&lang=en-US

and in the other computer:

Affected Firefox version: 51.01 64bit (51.0.1+build2-0ubuntu0.16.04.1) installed from official repo
Ubuntu version: Xenial (16.04.1)
Build that works fine: https://download.mozilla.org/?product=firefox-51.0.1-SSL&os=linux64&lang=en-US

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "ff.log"
   https://bugs.launchpad.net/bugs/1663349/+attachment/4816008/+files/ff.log

** Tags removed: get

** Description changed:

  getUserMedia doesn't ask for permission to use microphone, it simply
- says "NotFoundError: The object can not be found here." The test used
- is: https://mozilla.github.io/webrtc-landing/gum_test.html
+ says "NotFoundError: The object can not be found here."
  
- This happens only with the Ubuntu build of Firefox. The same version
- downloaded from the Mozilla website works fine and is not affected by
- this issue.
+ To reproduce:
+ 1. Go to https://mozilla.github.io/webrtc-landing/gum_test.html
+ 2. Click on the "Audio" button
+ Result:
+ Error message "NotFoundError: The object can not be found here."
+ Expected result:
+ Firefox should ask for permission to use the microphone
+ 
+ 
+ This happens only with the Ubuntu build of Firefox. The same version downloaded from the Mozilla website works fine and is not affected by this issue.
  
  Using a clean profile doesn't make a difference.
  
  The same problem happens on a different computer with different versions
  of Ubuntu and Firefox.
  
  I'm attaching an apport report just in case.
- 
  
  Affected Firefox version: 52.04b 64bit (52.0~b4+build1-0ubuntu0.14.04.1) installed from firefox-next PPA
  Ubuntu version: Trusty (14.04.5)
  Build that works fine: https://download.mozilla.org/?product=firefox-52.0b4-SSL&os=linux64&lang=en-US
  
  and in the other computer:
  
  Affected Firefox version: 51.01 64bit (51.0.1+build2-0ubuntu0.16.04.1) installed from official repo
  Ubuntu version: Xenial (16.04.1)
  Build that works fine: https://download.mozilla.org/?product=firefox-51.0.1-SSL&os=linux64&lang=en-US

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https://bugs.launchpad.net/bugs/1663349

Title:
  Microphone doesn't work in Ubuntu build but does in mozilla.org build

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