Preparing to replace linux-headers-2.6.32-31-generic-pae 2.6.32-31.61 (using linux-headers-2.6.32-31-generic-pae_2.6.32-31.61_i386.deb) ...
Unpacking replacement linux-headers-2.6.32-31-generic-pae ...
Setting up linux-headers-2.6.32-31-generic-pae (2.6.32-31.61) ...
Examining /etc/kernel/header_postinst.d.
run-parts: executing /etc/kernel/header_postinst.d/dkms 2.6.32-31-generic-pae /boot/vmlinuz-2.6.32-31-generic-pae
/etc/kernel/header_postinst.d/dkms: line 7: /dev/null: Permission denied
run-parts: /etc/kernel/header_postinst.d/dkms exited with return code 1
Failed to process /etc/kernel/header_postinst.d at /var/lib/dpkg/info/linux-headers-2.6.32-31-generic-pae.postinst line 110.
dpkg: error processing linux-headers-2.6.32-31-generic-pae (--install):
 subprocess installed post-installation script returned error exit status 2
Errors were encountered while processing:
 linux-headers-2.6.32-31-generic-pae