This provides instructions on installing the most recent version of the FRC Toolchain on our standard developer workstations.
Manually add the vivid PPA, as suggested by this post. Skip the package update when prompted.
Change the desired PPA relase from xenial to vivid as show below.
The vivid version of the toolchain depends on a older version of libisl as discussed here. The link to the libisl deb package can be found here, download the amd64 version and install.
At the command line run:
sudo apt update
sudo apt install frc-toolchain