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Update managing-vm-kernels.md

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Added GRUB installation steps:
- `grub2-install` on Fedora
- `grub-install` on Debian
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Saswat Padhi 2021-08-15 20:30:11 +00:00 committed by GitHub
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user/advanced-topics/managing-vm-kernels.md
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@ -252,9 +252,15 @@ Replace the version numbers in the example below with the ones appropriate to th
sudo dracut -f /boot/initramfs-4.15.14-200.fc26.x86_64.img 4.15.14-200.fc26.x86_64
~~~
Once the kernel is installed, you need to create a GRUB configuration.
Once the kernel is installed, you need to setup `grub2` by running:
~~~
sudo grub2-install /dev/xvda
~~~
Finally, you need to create a GRUB configuration.
You may want to adjust some settings in `/etc/default/grub`; for example, lower `GRUB_TIMEOUT` to speed up VM startup.
Then, you need to generate the actual configuration:
Then, you need to generate the actual configuration.
In Fedora it can be done using the `grub2-mkconfig` tool:
~~~
@ -287,7 +293,11 @@ Install distribution kernel image, kernel headers and the grub.
sudo apt install linux-image-amd64 linux-headers-amd64 grub2 qubes-kernel-vm-support
~~~
If you are doing that on a qube based on "Debian Minimal" template, a grub gui will popup during the installation, asking you where you want to install the grub loader. You must select /dev/xvda (check the box using the space bar, and validate your choice with "Enter".)
If you are doing that on a qube based on "Debian Minimal" template, a grub gui will popup during the installation, asking you where you want to install the grub loader. You must select /dev/xvda (check the box using the space bar, and validate your choice with "Enter".) If this popup does not appear during the installation, you must manually setup `grub2` by running:
~~~
sudo grub-install /dev/xvda
~~~
You can safely ignore this error message:
`grub2-probe: error: cannot find a GRUB drive for /dev/mapper/dmroot. Check your device.map`