I said: > The slow disk I/O in this virtual machine was the result of having > the VT feature disabled in the BIOS. Now it's working as expected > and the postinst still generates wrong ssh keys (so those two things > do not seem to be related after all).
Actually, no, it was not working as expected. I enabled the VT feature in the BIOS, but I forgot to change the XML file used by libvirt so that it uses KVM and not just QEMU. The pending change was something like this: -<domain type='qemu'> +<domain type='kvm'> - <emulator>/usr/bin/qemu-system-x86_64</emulator> + <emulator>/usr/bin/kvm</emulator> After I really started to use KVM, the problem in the virtual machine went away completely. Now I should probably reassign this to qemu just in case they want to investigate why this happens. Thanks.