Fix usage of grub-install command

Thanks: martin f krafft <madduck@debian.org> for spotting the problem
Closes: #755768

diff --git a/grml2usb b/grml2usb
index b7f1207..ef6a554 100755 (executable)
--- a/grml2usb
+++ b/grml2usb
@@ -1727,6 +1727,7 @@ def check_options(opts):
 def check_programs():
     """check if all needed programs are installed"""
     if options.grub:
+        global GRUB_INSTALL
         GRUB_INSTALL = which("grub-install") or which("grub2-install")
         if not GRUB_INSTALL:
             logging.critical("Fatal: grub-install not available (please install the "