I'm not sure what I've done, but at the end I just reinstalled everything.
You also can try to remove old connections from network-manager, just be sure not to delete important connections:
Code:
# rm -rf /etc/NetworkManager/system-connections/*
Purge old openvpn config:
Code:
# rm -rf /etc/openvpn
Delete and reinstall all packages:
Code:
# apt-get purge network-manager-openvpn network-manager-openvpn-gnome openvpn
# apt-get install network-manager-openvpn network-manager-openvpn-gnome openvpn
# service network-manager restart
and try again to install your openvpn config from VPN provider.