Fix up:

*** ERROR: ambiguous python shebang in /usr/lib64/virtualbox/vboxshell.py: #!/usr/bin/env python. Change it to python3 (or python2) explicitly.

--- VirtualBox-5.2.22/src/VBox/Frontends/VBoxShell/vboxshell.py.orig	2018-11-08 21:41:28.000000000 +0200
+++ VirtualBox-5.2.22/src/VBox/Frontends/VBoxShell/vboxshell.py	2018-11-09 15:30:41.869867030 +0200
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # -*- coding: utf-8 -*-
 # $Id: vboxshell.py $