On Sun, May 31, 2020 at 11:55:15AM +0200, haaber wrote:
> Thank you! I removed my debian-9 template long ago (surprised?), but I
> could re-install one for building. Just to evaluate the time-cost: how
> would "downgrade" work?

just install the right rpm for either kernel or debian template.
so close to no effort, just a bit of download+diskspace required.

they are all still in the repo, even if very outdated:

https://ftp.qubes-os.org/repo/yum/r4.0/current/dom0/fc25/rpm/

check the kernel-qubes-vm-* and kernel-latest-qubes-vm-*

even more versions if you look at the -testing repo:

https://ftp.qubes-os.org/repo/yum/r4.0/current-testing/dom0/fc25/rpm/


minor points to consider:
- make sure you pick the *qubes-vm* pkg if you want a kernel for use in
  appvms.
- you can have as many vm-kernels installed as you have diskspace for.
- if you want to use many and use automated updates, may want to crank
  up installonly_limit in dom0:/etc/dnf/dnf.conf and add kernel-latest
  and kernel-latest-qubes-vm to installonlypkgs.
- depending on how you install the pkgs, you may have to use --force to
  make it install _older_ pkgs than already installed.


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