Need help finding unity3d public key ubuntu

Hi, i am currently working on getting my unity3d to work on ubuntu so I can play dead frontier. however I have hit a snag and I have to elevate the trust for unity3d. In terminal when I enter command line: sudo pipelight-plugin --update unity3d

I end up with:

root@engine-Presario-CQ56-Notebook-PC:/home/engine# sudo pipelight-plugin --update unity3d --2016-06-03 16:36:57-- https://bitbucket.org/mmueller2012/pipelight/raw/master/share/install-dependency-1434FC73.sig Resolving bitbucket.org (bitbucket.org)... 104.192.143.1 Connecting to bitbucket.org (bitbucket.org)|104.192.143.1|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 29488 (29K) [text/plain] Saving to: ‘/tmp/tmp.j2G8QXdbO1’

100%[======================================>] 29,488 --.-K/s in 0.1s

2016-06-03 16:37:07 (223 KB/s) - ‘/tmp/tmp.j2G8QXdbO1’ saved [29488/29488]

gpg: Signature made Sun 29 May 2016 01:13:40 PM CDT using RSA key ID 1434FC73 gpg: Good signature from "Pipelight Dev Team (install-dependency) " gpg: WARNING: This key is not certified with a trusted signature! gpg: There is no indication that the signature belongs to the owner. Primary key fingerprint: CF23 08D4 3507 9A77 124E 01A2 83C7 3FB2 1434 FC73

Script dependency-installer is already up-to-date. ERROR: Unknown argument unity3d.

In order for me to fix this I have to put in command line: gpg --import theirpubkey.asc

however I do not know how or were I can find the public key for unity3d. any help would be appreciated.