Modify the boot time of grub in ubuntu

The online search to modify the grub startup time is basically to modify /etc/default/grub

#Comment out GRUB_HIDDEN_TIMEOUT=0
#GRUB_HIDDEN_TIMEOUT=0
#Modify GRUB_TIMEOUT = 0 
GRUB_TIMEOUT = 0

Then run update-grub to regenerate /boot/grub/grub.cfg. However, this does not work and you still have to wait 30 seconds.

View /boot/grub/grub.cfg

### BEGIN /etc/grub.d/00_header ###
...
function recordfail {
 set recordfail=1
 # GRUB lacks write support for lvm, so recordfail support is disabled.
}
...
if [ "${recordfail}" = 1 ] ; then
 set timeout=30
...
if [ $grub_platform = efi ]; then
 set timeout=30
...
### END /etc/grub.d/00_header ###

From the above configuration, we can see that if it is an lvm partition, the timeout is 30 seconds; if it is an EFI boot, the timeout is 30 seconds. The priority is EFI > LVM.

Let's take a look at the /etc/grub.d/00_header script that generates this configuration.

...
  cat << EOF
if [ "\${recordfail}" = 1 ] ; then
 set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
else
EOF
...
if [ "$recordfail_broken" = 1 ]; then
 cat << EOF
if [ \$grub_platform = efi ]; then
 set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
 if [ x\$feature_timeout_style = xy ] ; then
  set timeout_style=menu
 fi
...

You can see that this timeout of 30 seconds is set by the value of GRUB_RECORDFAIL_TIMEOUT.

So just add or modify GRUB_RECORDFAIL_TIMEOUT in /boot/grub/grub.cfg

GRUB_RECORDFAIL_TIMEOUT=0

Then run sudo update-grub to regenerate /boot/grub/grub.cfg.

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