How to disable OpenVPN from autostarting at boot-up or reboot?

You have two options:

Run:
```
sudo update-rc.d openvpn disable
```
Then you'll have to run sudo service openvpn start to manually start the VPN.
Or edit the file /etc/default/openvpn
```
sudo gedit /etc/default/openvpn
```
And uncomment the line:
```
#AUTOSTART="none"
```
So it looks like:
```
AUTOSTART="none"
```
Then you'll have to run sudo service openvpn start <vpn-name> to manually start the VPN. <vpn-name> is the config file name without .conf.

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