Near the end of the verbose boot process, I see a line saying:

"sed: can't move /etc/default/keyboardxxxxxx to /etc/default/keyboard. No such file or directory."

xxxxxxx being a bunch of characters that seem to change on each reboot.

My Knoppix 7.4-EN DVD LXDE 32-bit is installed on a USB key with a persistent overlay of 4GB.

In 'etc/default/keyboard', I have edited XKBLAYOUT to read "fr" instead of "us", but the error message already appeared well before that editing.

Otherwise, Knoppix does not complain and boots properly. I shall continue to ignore that error if it cannot be fixed.