I live in Iran and as you know there's a blocking system here. The people here use VPNs to access websites. I did the same. But days ago VPNs (PPTP, L2TP,SSTP) ports was blocked too. The alternatives was Freegate and free software similar to it. People mostly use these software in Windows. But I want a thing which supports Ubuntu too. Furthermore I know that port 443 is not filtered. Do you think is it possible to use OpenVPN in this situation?
There are a number of different ways to bypass government bans on websites. And one of them is Tor Browser.
Further information can be obtained from: www.torproject.org
And download options are here: www.torproject.org/projects/torbrowser.html.en
EDIT: Although it's fairly straightforward as this Tor Browser Bundled runs as a portable tool, a PPA channel might also come very handy, at least for automatic updates: