I think what is required is for somebody who has a digital signature to write
the procedure for using a digital signature and installing a digital
certificate onto a computer. This installation of a digital certificate onto
a computer does have to be very generic because of different setups and
operating systems.
I also suggest that whoever writes the procedure uses a computer with Ubuntu
installed using the Radiance theme. That way screen shots taken would match
Chapter 6 in the Calc Guide. The alternative is to tell me how to install a
digital certificate on an Ubuntu operating system so that I can write the
procedure. I do have access to the free CA Cert Signing Authority
certificate.
With regards
PeterS