What does this plugin do?
It does not appear to be possible to enable it using Compiz from the repositories, but I would still like to learn what the plugin does so I can decide whether it might be useful to me.
Ubuntu – What does the ‘Userspace file system’ Compiz plugin do
compizplugins
Related Solutions
OK, while writing the question I found my own answer. The plugin is located in the compiz-plugins package that can be installed with:
sudo apt-get install compiz-plugins
I don't know if this package stopped being a dependency to CCSM or something, because I don't remember having to install it before.
As mentioned before, unity is stuck with compiz.
But if you are willing to experiment, I suggest the Gala WM of elementary
sudo add-apt-repository ppa:elementary-os/daily
sudo apt-get update
sudo apt-get install gala
gala --repĺace
I am unaware if this plays ok with Unity, I removed Unity on my mschine. I personally pair this with MATE Desktop.
For expo you would also need dconf-editor to tweak when its Expo is used. It does have default keypress but you can also assign a hot spot to activate Expo.
Best Answer
It just maps compiz options to a filesystem using a FUSE mount. So you can have /foo/compiz/plugins/move/screen0/options/whatever and that lets you get/set the whatever option in the move plugin.
It's entirely worthless and as far as I'm aware has never actually been used for anything. davidr apparently got bored and people keep making sure it compiles so it never gets removed.