Hi Fabian!
Notice: I does not tested the following method on Toutatis, but on Brigantia
it works well.
Back in time when Trisquel 5.5 was released, the upstream Ubuntu 11.10 moved
to Gnome 3, and to preserve the old Gnome 2 feel and look, the main developer
decided to use Gnome 3 Fallback as the default session to work on, so there
is no Gnome Shell even if you have a free software compatible hardware.
Unlike previous releases, Brigantia is using Metacity as the default window
manager and that's the reason you does not see those funky effects like
before. If you want all of these back, you need to follow these points:
1. Make shure you have installed a package called 'compiz-gnome'. You can
use either 'Synaptic' or enter
$ sudo apt-get -y install compiz-gnome
in Terminal to install it (if you're upgraded to Brigantia, it is likely
you'll have it already).
2. Open Terminal and write
$ sudo sed -i s/metacity/compiz/
/usr/share/gnome-session/sessions/gnome-classic.session
This will replace Metacity with Compiz to have an accelerated desktop
experience. To revert made changes, just switch 'metacity' and 'compiz' in
the command.
3. Log out and log in back, or press [Alt]+[F2] and enter 'compiz
--replace'.
4. Hopefully, you'll now have the "classic" experience back :-)
P.S.: For some reason, customizing the Gnome Panel doesn't work under Compiz,
but you can use the following workaround:
1. Go to 'Menu -> System Settings -> Keyboard -> Shortcuts -> System'
and assing 'Alt+F2' to 'Show the run command prompt'
2. Press [Alt]+[F2] and enter 'metacity --replace'. This will bring
you back to Metacity.
3. Move the cursor above a clean part of the Gnome Panel and press
[Alt]+[Right-click]. This will bring you up the needed menu.
4. When you're done, press again [Alt]+[F2] and enter 'compiz
--replace'. That's it!