> I think the issue is that you're booting the image from a USB stick, but
> the kernel and initramfs don't have an appropriate driver. So it cannot
> mount the root filesystem.
>
> On my rockpi, I had to add a few modules (specifically sdhci, sdhci-pltfm,
> phy-rockchip-usb and phy-rockchip-inno-usb2) before I switched to the
> linux-libre-arm64-generic kernel, which contains these drivers.
>
Thanks for the hints!
> You could boot another linux distro and use the manual installation
> procedure to work around this issue.
Ok, something I need to learn. I'll further look at the manual.
David.