When I am trying to instal Let’s Encrypt on to my Plesk server using the extensions panel I get the following error:
Fout: Kan de extensie niet installeren: Executing /opt/psa/admin/plib/modules/letsencrypt/scripts/post-install.php failed: Bootstrapping dependencies for debian squeeze… WARNING: The following packages cannot be authenticated! libffi5 E: There are problems and -y was used without --force-yes
However it seems that let’s Encrypt does get installed because it is added to my extensions panel, but when trying to add a SSL certificate it doesn’t work and I get the following error:
Fout: Het installeren van het Let’s Encrypt SSL-certificaat is mislukt: Installation is broken.
I have searched online for some solutions but I cannot find any similar problems…
Can you guys help out?