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dfaulken
Asked: 2017-06-09 09:11:22 +0800 CST

Travis CI: apt-get installs one version of Firefox, firefox executable is still another?

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14.04.5 LTS.

I need Firefox >=48 for my Travis build: https://travis-ci.org/umts/incidents/builds/240872628

So I sudo apt-get update and sudo apt-get install firefox, which says:

Unpacking firefox (53.0.3+build1-0ubuntu0.14.04.2) ...

etc.

But then my automated tests were failing with the same exact message as when I had the built-in version of firefox (38.4.0esr). So as a sanity check, I added firefox -v after the install, which returns:

(process:5877): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
Mozilla Firefox 38.4.0

Perhaps that failed C assertion is meaningful here? But on the face of it, apt is installing one version of a package, but then using that package gives me a much older version, despite apt having returned no error messages.

How can I successfully install and use Firefox >=48 in this context?

14.04

2 Answers

  1. Best Answer

    On Travis CI, Firefox is pre-installed at /usr/bin/X11/firefox, which seems to be the build geckodriver was using, regardless of whether I used update-alternatives to specify which one I wanted.

    So I started my build with:

    whereis firefox | tr ' ' '\n' | grep bin | xargs sudo rm

    to remove all existing versions of firefox. Then sudo apt-get update and sudo apt-get install firefox as in my question. This worked.

    Thanks Ravexina for your debugging help!

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  2. Seems you have two version of Firefox installed on your Ubuntu.

    one which has been installed using package manager is located at:

    /usr/bin/firefox

    the other which your system is using (I guess you installed it somehow manually) is located at:

    /usr/local/bin/firefox

    use:

    sudo update-alternatives --config x-www-browser

    to set the /usr/bin/firefox as your default browser. you can also run it using absolute path like /usr/bin/firefox, for example to see the version of firefox:

    /usr/bin/firefox -v
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