I am looking for a stable VPN server which is known to work with iOS and OSX clients.
If possible, I prefer packages that are installable via:
sudo apt-get install XXX.
OpenVPN can be installed through the Ubuntu repositories and even has a GUI client on Apple.
OpenVPN can be installed like so:
It seems GuizmOVPN supports OpenVPN connections from iOS
According to this site, All OpenVPN connections require a jailbroken Apple Device.
Here is a list of supported VPN connections with iOS: http://support.apple.com/kb/HT1288
I'm really only familiar with OpenVPN on Ubuntu, so I'm not sure I can be of much more help.