There is a debian package available. It can be installed using the following command:
sudo dpkg -i jdrivesync_0.4.2_all.deb
Please note that jdrivesync requires openjdk-8-jre. How to install openjdk in version 8 for Ubuntu <14.10 is explained here.
After successful installation you can start jdrivesync with:
/opt/jdrivesync/jdrivesync.sh