package linux-image-2.6.31-20-generic 2.6.31-20.57 failed to install/upgrade:

[Howard Froggatt]

Binary package hint: grub

package linux-image-2.6.31-20-generic 2.6.31-20.57 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1.
menu.lst had been altered, by me.
On the list of options I first looked at compare and then pressed cancel in the hope of going back to choose, but remaining installation continued but with error messages

ProblemType: Package
Architecture: amd64
Date: Wed Feb 10 22:14:29 2010
DistroRelease: Ubuntu 9.10
ErrorMessage: subprocess installed post-installation script returned error exit status 1
NonfreeKernelModules: nvidia
Package: linux-image-2.6.31-20-generic 2.6.31-20.57
ProcVersionSignature: Ubuntu 2.6.31-20.57-generic
SourcePackage: grub
Title: package linux-image-2.6.31-20-generic 2.6.31-20.57 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
Uname: Linux 2.6.31-20-generic x86_64