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When searching for how to install Firefox, results show how to update it (not helpful). I assume it's because Firefox USED TO BE the default browser, but now it is not installed with my version of Ubuntu (Ubuntu 16.04). So, I would appreciate clear info on the how to INSTALL Firefox question.

Question: How do I install Firefox on Ubuntu 16.04?

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    Er, what? Firefox is most certainly still the default browser for 16.04 and comes pre-installed.
    – Seth
    Jan 18, 2018 at 4:56
  • Possible duplicate of Unable to install Firefox using Ubuntu Software Center and how to update an individual app through terminal
    – karel
    Jan 18, 2018 at 5:52
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    Possible duplicate of How do I install software using the Ubuntu Software Center?
    – muru
    Jan 18, 2018 at 6:43
  • @karel OP's not asking how to upgrade an app and there's no evidence his problem is your other link.
    – Seth
    Jan 18, 2018 at 17:50
  • The reason I added the second link is that in one of the answers it said that Firefox was already installed by default and if I didn't include that link then the OP could claim that this is a unique question because I didn't include a second link to confirm it, instead of a duplicate question because I did include a second link to confirm it.
    – karel
    Jan 18, 2018 at 21:30

3 Answers 3

Reset to default
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Open Terminal and run 

sudo apt install firefox
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    Note: If anyone is getting E: Package 'firefox' has no installation candidate then you'll want to run sudo apt update first.
    – user606179
    May 16, 2019 at 20:58
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The easiest way is to install it is to click on "ubuntu software" on the desktop, then search and install from there.

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This worked for me:

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A6DCF7707EBC211F
$ sudo apt-add-repository "deb http://ppa.launchpad.net/ubuntu-mozilla-security/ppa/ubuntu bionic main"

$ sudo apt update
$ sudo apt install firefox
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