The Video chat feature for GMail in Linux is currently supported only on Ubuntu and Debian based systems. (RPM releases to come soon).
1. As with Windows and Mac, you have to download a Linux compatible plugin for GMail videochat. You can either download the Linux Plugin for GMail Videochat from the Videochat page or download it directly from this link. [.DEB File, 5.6 MB Download].
2. After the download is over, you can double click the .DEB file you just downloaded to start the Package Manager and install the plugin.
3. The Installation requires a dependency: libglew 1.5. But you need not worry as your Ubuntu / Debian package manager will handle it for you.
4. After the installation is over, make sure you restart your Browser for the settings and new changes to take effect. Bingo! you can now start Video chatting with you friends right away from Linux too 
Shailesh Agarwal's Blog 
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