Use a Shell extension, it can be downloaded through Gnome's official site: https://extensions.gnome.org/extension/425/project-hamster-extension/
(Thanks to @tm_lv for heads-up)
EDIT: Installing the extension locally using gnome-tweak-tool apparently crashes Shell. The extension must be installed using
waf as described in README, however it's not that easy. You need a few packages to build the extension
sudo apt-get install gettext intltool
Now download the source using
git or https://github.com/tbaugis/hamster-shell-extension/downloads
Once you clone/unpack the source, go into the created directory and execute
./waf configure --prefix=/usr
sudo ./waf install
This will install the extension into
The extension will appear in gnome-tweak-tool in Extensions section once you restart Gnome Shell.
To uninstall the extension, execute this from the source directory:
sudo ./waf uninstall
Note that this extension doesn't play well with the older version of Hamster available in Ubuntu repository, more details are in this bug report. You better build the newest version of Hamster yourself, as described on Hamster's site. Remember to uninstall
hamster-applet first and install dependencies for "Debian-based" system.