There is an error in your configuration file. The following lines
postinst_hook = usr/sbin/update-grub
postrm_hook   = usr/sbin/update-grub

should be
postinst_hook = /usr/sbin/update-grub
postrm_hook   = /usr/sbin/update-grub

or just 
postinst_hook = update-grub
postrm_hook   = update-grub

-- 
package linux-image-2.6.24-21-generic 2.6.24-21.43 failed to install/upgrade: 
subprocess post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/290113
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