总结：
1、编辑 /etc/default/grub
GRUB_DEFAULT=saved
2、查看所有启动菜单入口
grep "submenu\|^\smenuentry" /boot/grub/grub.cfg | cut -d "'" -f2,4
输出格式为：标题’ID （中间以 ‘ 号间隔）
结果中含“Advanced options”的一行是 submenu ，底下紧跟的行是 menuentry。
3、设置默认启动菜单（内核），使用步骤2中的 ID 而非标题
#grub-set-default "(submenu ID)>(menuentry ID)"
4、重新生成 /boot/grub/grub.cfg
#grub-mkconfig -o /boot/grub/grub.cfg
原文摘要：
GRUB2 change default to custom kernel
I have made the switch from LILO to GRUB2 on all my Slackware boxes. Still learning all the ins and outs. I am running into an issue though when I want to change the default kernel to a custom compiled on. No matter what I do, the changes won’t take. Has anyone been successful in doing so? I have tried playing around with changing GRUB_DEFAULT=saved to GRUB_DEFAULT=2 and even using the actual title, but no success. I’ve also tried this:
Code:
Open /etc/default/grub and ensure this line exists:
GRUB_DEFAULT=saved
Apply the change to grub.cfg by running:
grub-mkconfig -o /boot/grub/grub.cfg
Now list all possible menu entries
grep “submenu\|^\smenuentry” /boot/grub/grub.cfg | cut -d “‘” -f2
Now set the desired default menu entry
grub-set-default “<submenu title>><menu entry title>”
Verify the default menu entry
grub-editenv list
Which I modified from this link. Still no luck.
Any help would be appreciated.
Old 07-14-2015, 12:09 PM #2
stormtracknole
Member
Registered: Aug 2005
Location: The Big Easy
Distribution: Slackware, RHEL
Posts: 927
Original Poster
Rep: Reputation: 114Reputation: 114
Figured it out! For GRUB_DEFAULT, I was using:
Code:
GRUB_DEFAULT=”Slackware-14.1 GNU/Linux, with Linux 3.18.18-local”
However, upon running grub-mkconfig -o /boot/grub/grub.cfg, I was instructed to use this instead:
Code:
GRUB_DEFAULT=”gnulinux-advanced-e246d5eb-623e-4518-ae21-96df0820c0c3>gnulinux-3.18.18-local-advanced-e246d5eb-623e-4518-ae21-96df0820c0c3″
I’m sure this code will be different depending on the kernel version used and probably other factors. I ran the grub-mkconfig command again, and this time, the correct kernel was loaded. Marking this thread as solved. Hopefully it can be of help to others.