網(wǎng)上查詢修改grub的啟動(dòng)時(shí)間基本上是修改 /etc/default/grub

#注釋掉GRUB_HIDDEN_TIMEOUT=0#GRUB_HIDDEN_TIMEOUT=0#修改GRUB_TIMEOUT = 0 GRUB_TIMEOUT = 0

然后運(yùn)行update-grub重新生成/boot/grub/grub.cfg.然而這并不管用,依舊要等待30秒

查看/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 ###

從上面的配置可以看到,如果是lvm分區(qū),則超時(shí)時(shí)間為30秒;如果是EFI方式啟動(dòng)的超時(shí)時(shí)間為30秒.優(yōu)先級(jí)EFI > LVM.

再看下生成這段配置的/etc/grub.d/00_header腳本

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

可以看到這超時(shí)30秒是通過GRUB_RECORDFAIL_TIMEOUT這個(gè)值設(shè)置的.

所以只需要在 /boot/grub/grub.cfg 加上或修改 GRUB_RECORDFAIL_TIMEOUT

GRUB_RECORDFAIL_TIMEOUT=0

然后運(yùn)行sudo update-grub重新生成/boot/grub/grub.cfg即可.

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