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I would like to replace Ubuntu's default Firefox package on my desktop with the "Developer Edition" available as a PPA (I am pretty new to package management).
I expected instructions found on PPA's page to be all I needed ..

$ sudo add-apt-repository ppa:ubuntu-mozilla-daily/firefox-aurora
$ sudo apt-get update
$ sudo apt-get upgrade
# "apt-get install --reinstall firefox" just re-install the original package.

Okey, Firefox Developer Edition is not getting installed (the original Firefox package is not replaced). And as you can see, apt policy does not show relevant ppa source candidate either.

$ sudo apt policy firefox
firefox:
  Installed: 51.0.1+build2-0ubuntu0.16.04.2
  Candidate: 51.0.1+build2-0ubuntu0.16.04.2
  Version table:
 *** 51.0.1+build2-0ubuntu0.16.04.2 500
        500 http://fr.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     45.0.2+build1-0ubuntu1 500
        500 http://fr.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

Following that thread I tried to elevate priority of ppa's package in /etc/apt/preferences.d with the following snippet:

Package: firefox
Pin: origin ppa.launchpad.net
Pin-Priority: 800

but apt policy still the same and executing apt-get update with apt-get upgrade did not changed anything.

/etc/apt/sources.list.d contains two files related to Firefox's PPA:
» ubuntu-mozilla-daily-ubuntu-firefox-aurora-xenial.list which contains

deb http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu xenial main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu xenial main
#deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu xenial main

» ubuntu-mozilla-daily-ubuntu-firefox-aurora-xenial.list.save contains

deb http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu xenial main

Thank you for helping me sorting this out.

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    I looked into the ppa, and there seems to be build failures (the red X), launchpad.net/~ubuntu-mozilla-daily/+archive/ubuntu/…. I suggest that you wait until there is a successful build, and try again. – sudodus Feb 23 '17 at 15:28
  • You could also try: $ sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa It gives me access to "firefox-trunc" version 53.0 – Jean-Marie Feb 23 '17 at 15:48
  • @sudodus Well pointed out, thank you I will wait a bit. By the way, can a previous successful build be installed until the last one finally succeeds ? – Stphane Feb 23 '17 at 15:50
  • @Jean-Marie Thank you for the suggest, the ppa has been fixed in the meantime. Firefox dev edition replaced firefox standard ed. – Stphane Mar 7 '17 at 14:04
  • @sudodus would you mind create an aswer so that I could upvote it and set this thread as resolved ? Thank you. – Stphane Mar 7 '17 at 14:08
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I looked into the ppa, and there seems to be build failures (the red X),

launchpad.net/~ubuntu-mozilla-daily/+archive/ubuntu/firefox-aurora/+packages

I suggest that you wait until there is a successful build, and try again (or try another version of Firefox).

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