upgrade error in linux-image-2.6.26-5-generic

Binary package hint: linux-image-2.6.26-5-generic

While installing from (up to date) Hardy to Intrepid I got following message:

Could not install 'linux-image-2.6.26-5-generic'

The upgrade will continue but the 'linux-image-2.6.26-5-generic' package may be in a not working state. Please consider submitting a bugreport about it.

subprocess post-installation script returned error exit status 2

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 8.10
ErrorMessage:
 ErrorMessage: subprocess post-installation script returned error exit status 2
NonfreeKernelModules: cisco_ipsec nvidia
Package: linux-image-2.6.26-5-generic 2.6.26-5.17 [modified: lib/modules/2.6.26-5-generic/modules.pcimap lib/modules/2.6.26-5-generic/modules.dep lib/modules/2.6.26-5-generic/modules.ieee1394map lib/modules/2.6.26-5-generic/modules.usbmap lib/modules/2.6.26-5-generic/modules.isapnpmap lib/modules/2.6.26-5-generic/modules.seriomap lib/modules/2.6.26-5-generic/modules.alias lib/modules/2.6.26-5-generic/modules.symbols]
ProcCmdLine: User Name=UUID=326194a6-e743-4d06-8c5e-7d19610be993 ro splash
ProcVersionSignature: Ubuntu 2.6.24-19.36-generic
SourcePackage: linux
Title: package linux-image-2.6.26-5-generic 2.6.26-5.17 [modified: lib/modules/2.6.26-5-generic/modules.pcimap lib/modules/2.6.26-5-generic/modules.dep lib/modules/2.6.26-5-generic/modules.ieee1394map lib/modules/2.6.26-5-generic/modules.usbmap lib/modules/2.6.26-5-generic/modules.isapnpmap lib/modules/2.6.26-5-generic/modules.seriomap lib/modules/2.6.26-5-generic/modules.alias lib/modules/2.6.26-5-generic/modules.symbols] failed to install/upgrade: