WebUI glitching and kicking me back to the Server Overview Page

I tried it in Edge, Firefox (windows and OpenSuse) and internet explorer on Win7. I believe it to be something with Java and keep trying to update it via the guide on this thread: Which version of JAVA are you using? but it gives me errors of
“Command ‘apt-get update’
failed with return code 100 and error message
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906
W: There is no public key avaiable for the following key IDs:
7368D0442B90D010
E: dpkg was interrupted, you must manually run ‘dpkg --configure -a’ to correct the problem”

I am a linux noob so I know nothing about how to manually “downloading the runtime manually, and setting MineOS to use the new java:” :frowning:

But I am pretty good at following instructions if someone knew how :wink: