diff -rupN cobbler-2.0.7.old/koan/virtinstall.py cobbler-2.0.7/koan/virtinstall.py
--- cobbler-2.0.7.old/koan/virtinstall.py	2015-01-22 11:11:27.917649507 -0500
+++ cobbler-2.0.7/koan/virtinstall.py	2015-01-22 11:30:07.849523465 -0500
@@ -69,7 +69,16 @@ except:
         for variant in variants:
             supported_variants.add(variant.split()[0])
     except:
-        pass # No problem, we'll just use generic
+        try:
+            # maybe on newer os using osinfo-query?
+            rc, response = utils.subprocess_get_response(
+                    shlex.split('osinfo-query os'))
+            variants = response.split('\n')
+            for variant in variants:
+                supported_variants.add(variant.split()[0])
+        except:
+            # okay, probably on old os and we'll just use generic26
+            pass
 
 def _sanitize_disks(disks):
     ret = []
@@ -362,6 +371,12 @@ def build_commandline(uri,
             found = False
             if os_version in supported_variants:
                 cmd += "--os-variant %s " % os_version
+            elif os_version + ".0" in supported_variants:
+                # osinfo based virt-install only knows about major.minor
+                # variants, not just major variants like it used to. Default
+                # to major.0 variant in that case. Lack of backwards
+                # compatibility in virt-install grumble grumble.
+                cmd += "--os-variant %s" % os_version + ".0 "
             else:
                 print ("- warning: virt-install doesn't know this os_version, defaulting to generic26")
                 cmd += "--os-variant generic26 "