I have no idea what's going on, or how to fix this. When I browse to some sites like Amazon or Bandcamp, I'm getting one of those
Your connection is not private errors in chromium. What's weird about this is when I switch to using FireFox I can load those sites just fine (and the SSL certs are accepted).
I'm also running chromium on another Ubuntu instance (same versions) and I'm not getting these errors. Only one this one machine.