Editing of GRUB does NOT help... (-How to jump over the GRUB menu...)

#1
Hi all,
in your guide for dual boot systems with Linux (your case Ubuntu 10.04, my case Xubuntu 14.04 LTS !!)

Ubuntu

you are suggesting in STEP SIX to change “GRUB_TIMEOUT=10″ to “GRUB_TIMEOUT=0″ and to save. Then you must update GRUB. This should allow "jumping over" the Grub-Menu.

Well I was following this guide, everything was doing alright. But the editing of the TIMEOUT-value (10 sec to 0 sec) does not lead to success. After selectoing the Linux-System in the Windows Boatloader I am running into the GRUB menu which I wanted to avoid.
Any idea? Can somebody help me?

Regards, HL