I think I have solved the problem partially. I have edited
"/etc/kernel/postinst.d/zz-update-grub" and "/etc/kernel/postrm.d/zz-
update-grub" files as root and disabled the line "exec update-grub" by
prefixing it with "#". Then re-run the Ubuntu Update Manager, this time
it succeeded all the updates. After the installation, I have reverted
the above two files to their originals and re-run update-grub, this time
with no failure! Lucky me :) After all these updates, Ubuntu 10.10 now
looks gorgeous!

-- 
package grub-pc 1.98 20100804-4ubuntu6 failed to install/upgrade: ErrorMessage: 
subprocess installed post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/637861
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