I find that dom0's /var/lib/qubes/vm-kernels/ does not list a 
5.4 kernel, despite that dom0 uname reports running it. After I run

  # qubes-dom0-update kernel-latest-qubes-vm

a 5.4 kernel is now listed, and is now selectable using
Qube Settings/Advanced.


Thank you.

On Monday, February 24, 2020 at 1:44:02 PM UTC-5, Andrey Arapov wrote:
>
> Question: How to get VMs to boot to a newly installed kernel?
>
>
> To change the default kernel for VM's:
>
> [arno@dom0 ~]$ uname -r
> 4.19.100-1.pvops.qubes.x86_64
> [arno@dom0 ~]$ qubes-prefs -s default_kernel 4.19.100-1
>
> the value should correspond to what you find in 
> /var/lib/qubes/vm-kernels/, e.g.
> /var/lib/qubes/vm-kernels/4.19.100-1/vmlinuz
>
> And restart the VM's.
>
> To change the kernel for a specific VM only:
> qvm-prefs -s <VM> kernel 4.19.100-1
>
>
> Kind regards,
> Andrey Arapov
>

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