I just got a new computer and installed version 3.2 of Astrill's VPN client for debian based linux OSes.
It runs fine and created an icon on the desktop, but:
a) there is no panel icon when it starts (and ergo I can't lock it to the panel using the right click menu)
b) I cannot find it when searching using the unity menu
c) each time it starts it acts as if it's freshly installed (asked me to install browser plugin, and enter username and password regardless of whether I'd clicked remember password before)
Disclaimer: I'm documenting this problem and solution so I don't have to re-discover it each time I reinstall Ubuntu. If anyone has a better solution though I'd be happy to see a better answer.