Update OS in README.md

Author: boomanaiden154

README.md

@@ -52,7 +52,7 @@ values for the flag could be:
 
 Currently, the assumptions for the system are:
 
-*   Recent Ubuntu distro, e.g. 20.04
+*   Recent Ubuntu distro, e.g. 22.04
 *   python 3.10.x/3.11.x
 *   for local training, which is currently the only supported mode, we recommend
     a high-performance workstation (e.g. 96 hardware threads).