[Bug 1317039] [NEW] GRUB2 GRUB_TIMEOUT=0 not working when other OS found

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After updating Ubuntu 12.04.4 (amd64) hiding of GRUB2 menu not longer
works. The menu always appears for 10s.

Reson found in /etc/grub.d/30_os-prober
...
adjust_timeout () {
  if [ "x${found_other_os}" != "x" ]; then
    cat << EOF
set timeout_style=menu
if [ "\${timeout}" = 0 ]; then
  set timeout=10
fi
...

if another OS is found, the /etc/default/grub entry GRUB_TIMEOUT=0 is
ignored because set to 0 in function adjust_timeout()

In my point of view this is a bug, because it's not longer possible to
hide grub2 menu if another OS is detected on the host.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
-- 
GRUB2 GRUB_TIMEOUT=0 not working when other OS found
https://bugs.launchpad.net/bugs/1317039
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