Unable to connect to ppa.launchpad.net:http: [IP: 91.189.95.85 80]
Solution 1:
I have the same issue, but only with VPN connection (IP 163.XXX.XXX.XXX). With no VPN (IP 77.XXX.XXX.XXX) its Ok. Probably problem in launchpad.net firewall (or traffic filter, or something like that).