Disable Secure Boot support by default

We're seeing failing boots on some Dell servers and it seems
to be related to some EFI firmware situation. Until this is
resolved and we find a long-term strategy WRT Secure Boot
let's disable Secure Boot support in our ISOS by default.

Closes: https://github.com/grml/grml-live/issues/64

diff --git a/grml-live b/grml-live
index c1a37d9..f4d1f2e 100755 (executable)
--- a/grml-live
+++ b/grml-live
@@ -428,7 +428,7 @@ fi
 [ -n "$HOSTNAME" ]                || HOSTNAME='grml'
 [ -n "$HYBRID_METHOD" ]           || HYBRID_METHOD='isohybrid'
 [ -n "$RELEASENAME" ]             || RELEASENAME='grml-live rocks'
-[ -n "$SECURE_BOOT" ]             || SECURE_BOOT='ubuntu'
+[ -n "$SECURE_BOOT" ]             || SECURE_BOOT='disable'
 [ -n "$SQUASHFS_EXCLUDES_FILE" ]  || SQUASHFS_EXCLUDES_FILE="${GRML_FAI_CONFIG}/config/grml/squashfs-excludes"
 [ -n "$SUITE" ]                   || SUITE='testing'
 [ -n "$TEMPLATE_DIRECTORY" ]      || TEMPLATE_DIRECTORY='/usr/share/grml-live/templates'