We have released Linux version of Vivliostyle Formatter. We verified it works on Ubuntu Desktop 14.04.3 LTS 64bit.
This release contains an executable and some dependent libraries. You may need to install some other dependent shared libraries to run the executable. (You don't need to if you are using Ubuntu Desktop 14.04.3 LTS 64bit.)
We are considering to use a package format that resolves dependencies (like deb or rpm) in the coming months.