Re: [Trisquel-users] how to verify trisquel 7 iso using gpg

[onpon4]

The signature file and md5sum file are both for the disc image. The signature  
isn't for the md5sum. Also, you don't need to tell GnuPG what file it's for;  
it figures that out from the filename.

But I suspect your actual problem is that you don't have a copy of Ruben's  
public key. You'll need to obtain a copy of that and import it to your  
keyring with gpg --import.