What type of VPN connection? If it is managed by NetworkManager, it should be brought down when network manager is brought down, *after* all network filesystems are brought down.
If not, that seems like a bug in whatever is running VPNs, but its probably not *this* bug. I would suggest reporting it separately with 'ubuntu-bug xxxx' where xxxx is the package which controls your VPN.
What type of VPN connection? If it is managed by NetworkManager, it should be brought down when network manager is brought down, *after* all network filesystems are brought down.
If not, that seems like a bug in whatever is running VPNs, but its probably not *this* bug. I would suggest reporting it separately with 'ubuntu-bug xxxx' where xxxx is the package which controls your VPN.