Eu tentei instalar o rabbitvcs-nautilus3 no Ubuntu 16.04 com este comando e recebi um erro:
$ sudo apt-get install rabbitvcs-nautilus3
Reading package lists...Done
Building dependency tree
Reading state information...Done
Package rabbitvcs-nautilus3 is not available,but is reffered to by another package.
This may mean that the package is missing,has been obsoleted, or
is only available from another sources
However the following packages replace it:
rabbitvcs-nautilus
E: Package 'rabbitvcs-nautilus3' has no installation candidate