Marking this as a duplicate of bug 261392:
Could not find postinst hook script [update-grub].
Looked in: '/bin', '/sbin', '/usr/bin', '/usr/sbin'
dpkg: error processing linux-image-2.6.28-6-server (--configure):
subprocess post-installation script returned error exit status 2
Marking this as a duplicate of bug 261392:
Could not find postinst hook script [update-grub].
Looked in: '/bin', '/sbin', '/usr/bin', '/usr/sbin'
dpkg: error processing linux-image- 2.6.28- 6-server (--configure):
subprocess post-installation script returned error exit status 2