Hi All :
Today, Cumulative Update 2 for System Center 2012 R2 Configuration Manager released. There is also an updated version of the UNIX/Linux client to provide support for Ubuntu 14.04; It is referenced in the CU2 KB and has a standalone KB too.
Regarding how to install CU2, please refer : http://blogs.technet.com/b/justin_gao/archive/2014/06/21/you-need-to-know-how-to-apply-cumulative-update-1-for-system-center-2012-r2-configuration-manager-kb2938441.aspx
When updated, the Administrator Console version is 5.0.7958.1303:
The Client version that is displayed on the General tab of the Configuration Manager Control Panel item or the Client Version field of device properties in the Administrator Console is 5.00.7958.1303:
In the System Center 2012 R2 Configuration Manager console, you can see the Client Version in the collection: