Hi, everybody, finally I found a solution for fixing this: http://askubuntu.com/questions/57339/connect-disconnect-from-vpn-from- the-command-line
Just do as the above link answer said, it works for me (even after restarting) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1297849 Title: Virtual private network connection fails after distribution upgrade due to outdated Network Manager configuration files To manage notifications about this bug go to: https://bugs.launchpad.net/hundredpapercuts/+bug/1297849/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs