Hello,

When reconfiguring or reinstalling eudev-3.2.9-8~beowulf1 I don't have any
problem with the groups input, kvm and render being present already:
as root: dpkg-reconfigure eudev
[ ok ] Stopping hot-plug events dispatcher: udevd.
[ ok ] Starting hot-plug events dispatcher: udevd.

*******************************************************
  Warning: eudev will default to the older network
  interface names, such as eth0 or wlan0. If you use
  the new names, such as enp0s3, you will need to add
  the following to the boot command:
                net.ifnames=1
********************************************************

        
update-initramfs: deferring update (trigger activated)
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.133+deb10u1) ...
update-initramfs: Generating /boot/initrd.img-4.19.0-14-amd64

No failure here from eudev.postinst. Please help me find a way to reproduce this
bug. Is the usage of sudo the problem?

Thanks!