I have repeatedly all downloaded and reinstalled.
I have written:
/usr/bin/kvm -bios /usr/share/ovmf/OVFM.fd -m 5G -hda /dev/sdb
/usr/bin/kvm -bios /usr/share/ovmf/OVFM.fd -m 5G -drive file=/dev/sdb,format=raw
And for tests here I changed /dev/sdb to sda, b, c, ..., h in order to use HDDs and USBs.
The result is: devices that can be bootet in Legacy BIOS are bootet and work.
But devices which need to be UEFI booted are not booted but instead I fall into the EFI shell.
In the EFI shell I can use
an see the file NvVars. Nothig more is in this shell possible, and it is by no way possible to to come out of qemu.
But the UEFI device, a HDD, is bootable in UEFI mode, if this is done not via qemu but via the RESET button.
Please, does someone know a solution to this problem? Thanks Anton_Wessel@t-online.de
reporting new invstigations to this issue (16 07.2021 08:35).
I have totally new installed kubuntu 20.10 on my hdd, using a different USB live stick bought also from the same company, i.e.
Freies Open Source Unternehmen Chris Unger Tux-Onlineshop
but reveived 07.07.2021.