[SOLVED] Current information on using grub after install?

Biscotty666 · 07-21-2022, 05:40 PM

I found this https://docs.slackware.com/howtos:sl...based_hardware but it seems out of date since it talks about installing things which are now already on the system. Is this still the document I should follow?

colorpurple21859 · 07-21-2022, 08:42 PM

If this is a followup of your other threads,
chroot into the system, make sure efi partition is mounted to /boot/efi
run

Code:

 grub-install
grub-mkconfig -o /boot/grub/grub.cfg

exit out of chroot and reboot.

colorpurple21859 · 07-22-2022, 09:22 AM

Here is how to install grub bootlader during a installation
https://docs.slackware.com/howtos:sl..._first_install

Daedra · 07-22-2022, 09:56 AM

Using Grub is fairly simple. If you want a visual aid then OTB has a video on choosing Grub during the Slackware install. Skip to 24:53
https://www.youtube.com/watch?v=OZeJd5JPQro

However it should be noted that he is assuming you are using a UEFI and not legacy bios. If you are using legacy bios then the procedure is slightly different, but basically the same.

Biscotty666 · 07-22-2022, 10:56 AM

Quote:

Originally Posted by colorpurple21859

If this is a followup of your other threads,
chroot into the system, make sure efi partition is mounted to /boot/efi
run

Code:

 grub-install
grub-mkconfig -o /boot/grub/grub.cfg

exit out of chroot and reboot.

It kind of is. Booting is working fine so I closed the other thread. I just wanted to explore using grub instead of elilo.

Biscotty666 · 07-22-2022, 10:57 AM

Quote:

Originally Posted by colorpurple21859

Here is how to install grub bootlader during a installation
https://docs.slackware.com/howtos:sl..._first_install

Thank you. It is already installed but the document is still useful.

Biscotty666 · 07-22-2022, 10:59 AM

Quote:

Originally Posted by Daedra

Using Grub is fairly simple. If you want a visual aid then OTB has a video on choosing Grub during the Slackware install. Skip to 24:53
https://www.youtube.com/watch?v=OZeJd5JPQro

However it should be noted that he is assuming you are using a UEFI and not legacy bios. If you are using legacy bios then the procedure is slightly different, but basically the same.

Thank you. This computer does not even have legacy bios.

BTW I recognize your name from when I used to be here a lot and you have really helped me in the past. Thank you very much.

Biscotty666 · 07-22-2022, 11:03 AM

Maybe I just don't understand the basic interplay between elilo and grub which are both on my system and both new to me. What mechanism enables/selects one or the other assuming both are installed?

Daedra · 07-22-2022, 11:12 AM

well during the install process the installer gives you a specific option to "enable" either lilo or elilo. If you want to use Grub then during the install you simply skip installing lilo or elilo when prompted. Grub is already available during the install but you have to manually "install/enable" at the very end of the Slackware setup as shown in the above video.

Daedra · 07-22-2022, 11:16 AM

I forgot to mention, did you create a EFI partition before you started installing Slackware? If you are dual booting with windows 10 then this should already have been created for you, if not then you have to create one. An EFI partition is necessary with a UEFI system.

Biscotty666 · 07-22-2022, 02:43 PM

Quote:

Originally Posted by Daedra

I forgot to mention, did you create a EFI partition before you started installing Slackware? If you are dual booting with windows 10 then this should already have been created for you, if not then you have to create one. An EFI partition is necessary with a UEFI system.

Yes I had created one before install. After installation it appears to be mounted under /boot/efi.

Biscotty666 · 07-22-2022, 02:47 PM

Quote:

Originally Posted by Daedra

well during the install process the installer gives you a specific option to "enable" either lilo or elilo. If you want to use Grub then during the install you simply skip installing lilo or elilo when prompted. Grub is already available during the install but you have to manually "install/enable" at the very end of the Slackware setup as shown in the above video.

I selected elilo at install and it works fine now so my motivation to switch to grub is purely for learning. I would like to try grub instead of elilo out of curiosity. I was just looking for updated information because the referenced source does not seem to reflect 15.0.

Daedra · 07-22-2022, 02:58 PM

Quote:

Originally Posted by Biscotty666

I selected elilo at install and it works fine now so my motivation to switch to grub is purely for learning. I would like to try grub instead of elilo out of curiosity. I was just looking for updated information because the referenced source does not seem to reflect 15.0.

Understandable. You can do that in a virtual machine. If you are using Virtualbox just make sure you check "Enable EFI (Special OSes only)" in the VM settings then you are good to go to start experimenting.

colorpurple21859 · 07-22-2022, 03:22 PM

Quote:

Maybe I just don't understand the basic interplay between elilo and grub which are both on my system and both new to me. What mechanism enables/selects one or the other assuming both are installed?

The default one used is set in the firmware/bios. This can be changed on most system with efibootmgr.
On some systems efibootmgr can register a boot loader with the firmware/bios, however can not make it the default loader, this has to be done from the firmware/bios settings. This is particularly true of some Hp system

On most systems if there is no bootloader set in firmware/bios, the firmware/bios defaults to EFI\Boot\bootx64.efi

https://linux.die.net/man/8/efibootmgr
https://www.linuxbabe.com/command-li...otmgr-examples
https://wiki.archlinux.org/title/Uni...ware_Interface

Biscotty666 · 07-23-2022, 05:25 PM

Quote:

Originally Posted by colorpurple21859

The default one used is set in the firmware/bios. This can be changed on most system with efibootmgr.
On some systems efibootmgr can register a boot loader with the firmware/bios, however can not make it the default loader, this has to be done from the firmware/bios settings. This is particularly true of some Hp system

On most systems if there is no bootloader set in firmware/bios, the firmware/bios defaults to EFI\Boot\bootx64.efi

https://linux.die.net/man/8/efibootmgr
https://www.linuxbabe.com/command-li...otmgr-examples
https://wiki.archlinux.org/title/Uni...ware_Interface

Thank you. That is very useful.