Novell will try to recover from earlier Linux fumbles by releasing major updates, <A HREF="http://news.zdnet.com/2100-9590_22-6094603.html?tag=zdnn.alert">adding Xen virtualization software</A> to its enterprise server product and glitzy graphics to the desktop counterpart. The biggest change is arriving with Suse Linux Enterprise Server 10, the first major version of Linux to incorporate the Xen hypervisor software. Xen is designed to boost a computer's efficiency by letting it run multiple operating systems simultaneously.