It's not that this page is critically outdated or anything. But it is rather old.. I think it could be worth updating the page and including the information from this posting on linuxquestions.org :
https://www.linuxquestions.org/questions/slackware-14/grub2-in-slackware-discussion-and-instruction-4175727986/#post6447855 \\
I don't want to update this page, since I don't use UEFI and don't want to start changing the current content and adding the new content in the right places and so fourth. Making it a bit more readable/simple wouldn't hurt either. Here is the content of that post: \\
Originally Posted by LuckyCyborg View Post
Here's a mini-tutorial.
===== Installing GRUB2 =====
IF you have a hardware using UEFI, you should mount /boot/efi and execute this command:
grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=Slackware --recheck
===== Updating the GRUB2 configuration =====
All you have to do is to execute this command:
grub-mkconfig -o /boot/grub/grub.cfg
For your convenience in future, you can create this /usr/sbin/update-grub script:
#!/bin/sh
set -e
exec grub-mkconfig -o /boot/grub/grub.cfg "$@"
And there is time to reboot and enjoy your GRUB2 setup with the generic kernel.
On the future, each time you upgrade the kernel, you should execute this command:
grub-mkconfig -o /boot/grub/grub.cfg
That's all.