I have a very high ping on my internet connection to international game servers and I was told a VPN connection should do some trick to try to lower it. That said, I found my university has a public VPN service and got an account for it.
I am very inexperient with this and cannot configure the VPN connection correctly. With the correct settings (at least protocol, server, username and password are correct and I set to use Google's public DNS), I cannot connect. NetworkManager just tells me "fail to connect" with no apparent misconfiguration.
Also, I shall note that "pinging" my router using the VPN server (via SSH) gives me very unconsistent values:
rtt min/avg/max/mdev = 8.579/183.883/494.535/121.183 ms
While pinging the destination gives always very near 146ms (with less than 0.5ms maximum deviation) but I just guess it's fine.