Nicolas, the journal log shows that the VPN server hostname was not resolvable and eventually when it finally connected, it failed after calling a --up script. Could you provide this --up script and maybe the sanitized configuration of your VPN client?
** Changed in: openvpn (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1454725 Title: openvpn fails after upgrade from 14.10 to 15.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openvpn/+bug/1454725/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs