This question is practically identical to this question, but the difference being that the authentication server is freeRADIUS on Ubuntu and the access-points are DD-WRT.
Additionally, I would like to know if there is any risk to disabling TTLS (which from what I understand the part of the authentication process that requires the certificate) or if that is even an option.
I understand now that there is a difference between TLS and TTLS. I want to use TTLS, since it does not require client configuration. I have assigned the answer to the post below because it helped come to this realization and I have edited the title to better reflect his conclusion.