openvswitch-datapath-dkms 1.4.6-0ubuntu1.12.04.3: openvswitch kernel module failed to build [configure: error: Linux kernel source in /lib/modules/3.11.0-26-generic/build is not configured]

[afthon]

when i use this command "sudo dpkg-reconfigure openvswitch-datapath-dkms" suddenly this error appear.
i used that command for installing mininet.
http://mininet.org/download/
sorry, i can't explain more, because i dont know to tell you more in english :)

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: openvswitch-datapath-dkms 1.4.6-0ubuntu1.12.04.3
ProcVersionSignature: Ubuntu 3.11.0-26.45~precise1-generic 3.11.10.12
Uname: Linux 3.11.0-26-generic i686
ApportVersion: 2.0.1-0ubuntu17.7
Architecture: i386
DKMSKernelVersion: 3.11.0-26-generic
Date: Thu Sep 25 22:28:29 2014
InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release i386 (20140204)
MarkForUpload: True
PackageArchitecture: all
PackageVersion: 1.4.6-0ubuntu1.12.04.3
SourcePackage: openvswitch
Title: openvswitch-datapath-dkms 1.4.6-0ubuntu1.12.04.3: openvswitch kernel module failed to build
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Chris J Arges (arges)]

Can you please try with the latest version? This should be working now.

[Launchpad Janitor (janitor)]

[Expired for openvswitch (Ubuntu) because there has been no activity for 60 days.]