package dahdi-dkms 1:2.2.1+dfsg-1ubuntu2 failed to install/upgrade: dahdi kernel module failed to build

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Binary package hint: dahdi-linux

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ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: dahdi-dkms 1:2.2.1+dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
Architecture: i386
DKMSBuildLog:
 DKMS make.log for dahdi-2.2.1+dfsg-1ubuntu2 for kernel 2.6.32-32-generic (i686)
 lun jun 20 15:34:17 ART 2011
 You do not appear to have the sources for the 2.6.32-21-generic kernel installed.
 make: *** [modules] Error 1
Date: Mon Jun 20 15:35:18 2011
ErrorMessage: dahdi kernel module failed to build
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
PackageArchitecture: all
PackageVersion: 1:2.2.1+dfsg-1ubuntu2
SourcePackage: dahdi-linux
Title: package dahdi-dkms 1:2.2.1+dfsg-1ubuntu2 failed to install/upgrade: dahdi kernel module failed to build