Hi Mathieu,

On Mon, 14 Sep 2020 15:26:52 +0200
Mathieu Othacehe <othacehe@gnu.org> wrote:

> Anything special with your hardware? KVM support disabled maybe?

The culprit had been the Linux kernel update to 5.8.8.

After downgrading to 5.8.7 it works just fine--no other changes done.

Previously, I had tried also to add wipefs -a before the parted--that
hadn't helped either.