It work fine after I purge the following package and re-install them:
network-manager-pptp network-manager-pptp-gnome ppp pppconfig pppoeconf
pptp-linux
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Oh, I forgot to say that my Ubuntu version is 13.04 x64
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Title:
PPTP VPN Service failed to start after upgrade to 13.04
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Title:
virtualbox-dkms 4.1.2-dfsg-1ubuntu1: virtualbox kernel module failed
to build
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ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: virtualbox-dkms (not installed)
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
DKMSKernelVers