I went to this page https://airvpn.org/linux/ selected Linux, 64bit, Debian/Ubuntu, Graphical UI, and then downloaded the file "eddie-ui_2.12.4_linux_x64_debian.deb".
So then I right clicked & selected "open with software install", then selected "Install" and nothing happens. It does not install.
I'm new to Ubuntu/Linux and I'm just wondering if someone can point me to a guide or can help me solve this issue. On OS X its just a matter installing it and signing in, simple. Not so simple with Ubuntu.