Hi Nic
Thanks for taking the time to report this bug in Ubuntu.
I think that you are correct in that the changes that you have made to
/etc/default/openvpn are the cause of this issue - this file is used for
configuration of the init script rather than setting up openvpn itself.
Please try
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https://bugs.launchpad.net/bugs/981974
Title:
package openvpn 2.2.1-8ubuntu1 failed to install/upgrade: subprocess
installed pre-removal script returned error exit
