[Trisquel-users] Installing a CA certificate authority system-wide

[vfvs]

hello! I need to install a CA certificate  
(http://www.autistici.org/en/ca/index.html this one) system-wide. How can I  
do this ?

I've tried importing that on Seahorse but, after showing me the certificate  
informations, the button "Import" isn't clickable, same thing as running  
seahorse as root.

I've also tried following this guide provided by the source of the  
certificate: http://www.autistici.org/en/stuff/man_ca/linux.html

All unsuccefully.

Thank you all for the help