Please go here for the download and instructions on the VPN client https://www.jmu.edu/computing/internet-and-network/vpn-client.shtml
The Linux client is available directly from the VPN server in 2 flavors, rpm and deb.
Once installed, this should operate similarly to the Windows/macOS versions. Any differences will be documented here as applicable.
You can launch the VPN client for Chrome OS (i.e., Chromebooks not the Chrome browser) from the chrome web store at https://chrome.google.com/webstore/detail/pulse-secure/eiddfaedmgnpnnojolcknhpjbmmpplgd
After loading the app, you can create a connection as follows:
After you've created a connection, you can connect to the VPN as follows: