I was able to install the plug-in using the command line like this: sudo dpkg -i google-talkplugin_current_amd64.deb
That produced this: Selecting previously unselected package google-talkplugin. (Reading database ... 196768 files and directories currently installed.) Preparing to unpack google-talkplugin_current_amd64.deb ... Unpacking google-talkplugin (5.41.0.0-1) ... Setting up google-talkplugin (5.41.0.0-1) ... After this, I restarted Firefox. I went to Gmail to make a phone call, and after clicking the "Allow" button prompted at the top of Firefox (under the address bar), it worked. However, in previous versions of Ubuntu, I was able to install this with the GUI exclusively. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573408 Title: Can't install Google-Talk deb plugin To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1573408/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs