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Setting ubuntu grub timeout when using efi

 # 1) Edit grub with vi

sudo vi /etc/default/grub


# 2) Add or modify the following part

GRUB_RECORDFAIL_TIMEOUT="5"


# 3) Update

sudo update-grub


The reason is

If you look at "/etc/grub.d/00_header"


if [ \$grub_platform = efi ]; then

set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}

if [ x\$feature_timeout_style = xy ] ; then

set timeout_style=menu

fi

fi


Because it's like this.

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