and .. while the installation on hdd (knx-hdinstall)
I have:

cp: reading 'var/lib/dpkg/info/t1lib1.postinst':Input/output error
cp: reading 'var/lib/dpkg/info/telnetd.list': Input/output error


but 'knoppix testcd' didn't indicate any errors. Versions from 20.05 and 06.06 are installing without any problems.
- best regards