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Changed CPUs (Athlon to Ryzen) now Grub shows up, how to fix?

Radium_Angel
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Go to solution Solved by Sauron,
8 minutes ago, Radium_Angel said:

AFAIK, nothing.

When I put in the new CPU, and powered back on, the mobo said "new CPU detected, resetting BIOS to default" which it was anyway (again, AFAIK) no OCing, no XMP, I think the only thing I had changed other than default, was turning off the TPM settings, since the board doesn't have a TPM unit anyway.

Nope and Nope.

Hence my surprise....

 

Try regenerating your grub configuration, maybe the BIOS reset randomly reassigned drive labels 

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

 

Posted

This is something I wasn't expecting.

My mobo had a lowly Athlon 3000 on it, but supported a Ryzen CPU.

So while under the Athlon, I installed Ubuntu 20.04 LTS (XFCE edition) and all was well.

Swapped out the Athlon to the Ryzen 5 2600, reconfigured the BIOS and when the system booted, the Grub loader shows up.

 

Confused, I typed "exit" (or quit, don't recall which) and the system proceeded to boot into Ubuntu normally.

But every time I reboot the system, Grub shows back up again.

 

This is a minor problem to be sure, but still not something I had expected. How do I fix this?

IMG_20200917_1216588.jpg

NOTE: I no longer frequent this site. If you really need help, PM/DM me and my e.mail will alert me. 

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23 minutes ago, Radium_Angel said:

reconfigured the BIOS

Well... what did you change?

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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Posted

This means grub can't find grub.cfg

Do you by any chance dual boot or have more than one drive?

Your CPU swap shouldn't have affected anything with Grub.

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27 minutes ago, Radium_Angel said:

reconfigured the BIOS and when the system booted

My bet is that you changed the default EFI boot setting, try to edit it.

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1 minute ago, Sauron said:

Well... what did you change?

AFAIK, nothing.

When I put in the new CPU, and powered back on, the mobo said "new CPU detected, resetting BIOS to default" which it was anyway (again, AFAIK) no OCing, no XMP, I think the only thing I had changed other than default, was turning off the TPM settings, since the board doesn't have a TPM unit anyway.

2 minutes ago, Nayr438 said:

Do you by any chance dual boot or have more than one drive?

Nope and Nope.

2 minutes ago, Nayr438 said:

Your CPU swap shouldn't have affected anything with Grub.

Hence my surprise....

 

NOTE: I no longer frequent this site. If you really need help, PM/DM me and my e.mail will alert me. 

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8 minutes ago, Radium_Angel said:

AFAIK, nothing.

When I put in the new CPU, and powered back on, the mobo said "new CPU detected, resetting BIOS to default" which it was anyway (again, AFAIK) no OCing, no XMP, I think the only thing I had changed other than default, was turning off the TPM settings, since the board doesn't have a TPM unit anyway.

Nope and Nope.

Hence my surprise....

 

Try regenerating your grub configuration, maybe the BIOS reset randomly reassigned drive labels 

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

 

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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You could fix it in a chroot, hopefully these paths and commands are correct. I don't use Ubuntu to verify it.

  • boot a live iso and open a terminal
  • fdisk -l to find the partition Ubuntu is installed to, also note the Fat32 partition
  • mkdir /mnt
  • mount /dev/partition /mnt
  • chroot /mnt
  • cat /etc/fstab , check and see if the Fat32 partition has a mount point
    • if, yes
      • mount /dev/fat32partition /mountpath_in_fstab
      • grub-install --target=x86_64-efi --efi-directory=mountpath_in_fstab --bootloader-id="Ubuntu"
    • if no
      • mkdir /boot/EFI
        • if the directory already exists, that's fine
      • mount /dev/fat32partition /boot/EFI
      • grub-install --target=x86_64-efi --efi-directory=/boot/EFI --bootloader-id="Ubuntu"
  • grub-mkconfig -o /boot/grub/grub.cfg
  • exit
  • reboot

 

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10 minutes ago, Sauron said:

Try regenerating your grub configuration, maybe the BIOS reset randomly reassigned drive labels 


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

 

This solved it, thank you for this :)

NOTE: I no longer frequent this site. If you really need help, PM/DM me and my e.mail will alert me. 

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4 minutes ago, Radium_Angel said:

This solved it, thank you for this :)

You're welcome!

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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On 9/17/2020 at 12:14 PM, Sauron said:

You're welcome!

For me when I try this it shows it can’t find command grub-mkconfig

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3 minutes ago, Rylyguy said:

For me when I try this it shows it can’t find command grub-mkconfig

What distro?

NOTE: I no longer frequent this site. If you really need help, PM/DM me and my e.mail will alert me. 

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1 minute ago, Radium_Angel said:

What distro?

I have macOS and windows dual booted

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1 minute ago, Rylyguy said:

I have macOS and windows dual booted

oh, MacOS will probably have an entirely different set of commands. You'd have to google the equivalent

NOTE: I no longer frequent this site. If you really need help, PM/DM me and my e.mail will alert me. 

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Just now, Radium_Angel said:

oh, MacOS will probably have an entirely different set of commands. You'd have to google the equivalent

Ok I had made another post and sauron replied sending me here

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13 hours ago, Rylyguy said:

I have macOS

Oh... you should have specified that in the post you made, grub is generally used with Linux

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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5 hours ago, Sauron said:

Oh... you should have specified that in the post you made, grub is generally used with Linux

I had put in the post that I was dual booted with macOS and windows

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