Improve the old kernel version detect, now the 3.8 kernel under 3.11 will be cleaned

Author: tualatrix

ubuntutweak/janitor/oldkernel_plugin.py

@@ -2,6 +2,7 @@
 import re
 import logging
 
+from distutils.version import LooseVersion
 from ubuntutweak.gui.gtk import set_busy, unset_busy
 from ubuntutweak.janitor import JanitorPlugin, PackageObject
 from ubuntutweak.utils.package import AptWorker
@@ -95,7 +96,7 @@ def _compare_kernel_version(self, version):
             else:
                 return False
         else:
-            return c1 > p1
+            return LooseVersion(c1) > LooseVersion(p1)
 
     def get_summary(self, count):
         if count: