I wish to install some extensions from https://extensions.gnome.org/. So here is a history of what I did. I install ubuntu 16.04.3 LTS. Successfully done. Now I installed gnome on it using the commands-

$ sudo apt update && sudo apt upgrade
$ sudo apt-get install ubuntu-gnome-desktop
$ sudo apt-get install chrome-gnome-shell

Last command just to ensure that it is installed (usually it is installed by default). I chose gdb3 on prompt while running the second command. Here are the info. with respect to the versions-

$ gnome-shell --version
GNOME Shell 3.18.5
$ firefox --version
Mozilla Firefox 57.0

Later on, I installed the firefox gnome-shell integration plugin from the firefox addons manager.

Even after logging out and rebooting, I am getting the following messages on firefox (my primary browser) and chrome respectively-

Firefox message:

enter image description here

Chrome message:

enter image description here

As a result, I can't install extensions from the site. Ask if any more info is needed. Please help!

  • 2
    Did you select GNOME session instead of Unity at the login screen? – pomsky Nov 23 '17 at 8:43
  • I did not get any option like that, but the login screen was not unity. – Harshit Agrawal Nov 23 '17 at 8:44
  • It was of gnome. – Harshit Agrawal Nov 23 '17 at 8:45
  • Output of echo $DESKTOP_SESSION? – pomsky Nov 23 '17 at 8:48
  • ubuntu. Now it looks like gnome-session is not running. – Harshit Agrawal Nov 23 '17 at 8:49

It looks like you have logged in to a Unity session instead of a GNOME session.

If you're using GDM3, there should be a cogwheel (⚙️) next to the "sign in" button at the login screen. Click on it and select GNOME instead of Unity.

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