Ubuntu now uses GNOME Shell, and one of the nice things about GNOME shell is that it is infinitely customization through extensions. It takes a bit of work to install extensions for GNOME Shell in Ubuntu, but once it is finished, you can install extensions at will.
To install extensions in GNOME Shell, you have to use a web browser, and you can use either Firefox or Chrome for that purpose. If you wish to use Firefox to install GNOME Shell extensions, open Firefox, visit this web page, and install the GNOME Shell Integration plugin for Firefox:
If you wish to use Chrome to install GNOME Shell extensions, open Chrome, and then visit this web page to install the GNOME Shell Integration plugin for Chrome:
Once that is finished, open a Terminal window by hitting the CTRL+ALT+T keys simultaneously, and then type this command:
sudo apt-get install chrome-gnome-shell
(Note that both Firefox and Chrome use the chrome-gnome-shell package.)
Once chrome-gnome-shell has finished installing, close your web browser and launch it again, and then navigate to this web page:
The most popular extensions will be listed. Click on each extension, and you will see a graphical ON/OFF slider switch. To install an extension, simply slide the extension’s switch to the ON position. A pop-up menu will ask if you wish to install the extension, and click on the INSTALL button to continue. To uninstall an installed extension, move the slider back to the OFF position.
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