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After upgrade from Ubuntu 11.10 to 12.04 I am unable to get Ubuntu to automatically boot. Even when I set grub.cfg as follows:

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

when rebooting, GRUB waits on its splash screen for keypressing on selected kernel.

Please help if you have any idea. I updated a grub by update-grub command with different timeout but it does not change.

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Did you edit grub.cfg or /etc/default/grub file. I think, it is the later one – Anwar Shah Aug 6 '12 at 10:05

You have to edit /etc/default/grub not grub.cfg. Change it from there and run

sudo update-grub2
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