After upgrading, I can use HTTP, HTTPS, DNS, OpenVPN, and ICMP. No other protocols work. I can’t access email, Steam won’t update games, HITMAN won’t connect to servers, etc. I’ve tried unproxying my HTTP/S connection, changing my DNS server, and editing the files described in this post: Wifi issue in 17.04
But the only thing that helps at all is connecting to my VPN, which allows my to access Gmail, but nothing further.
I use Private Internet Access for my VPN. When I use the OpenVPN option, only Gmail begins working, but when I use their proprietary client, everything works as it should.