Preparing to replace libecryptfs0 87-0ubuntu1 (using .../libecryptfs0_87-0ubuntu1.1_i386.deb) ...
Unpacking replacement libecryptfs0 ...
Preparing to replace ecryptfs-utils 87-0ubuntu1 (using .../ecryptfs-utils_87-0ubuntu1.1_i386.deb) ...
Unpacking replacement ecryptfs-utils ...
Preparing to replace gnome-user-guide 3.0.0+git20110406ubuntu10 (using .../gnome-user-guide_3.0.0+git20110406ubuntu11_all.deb) ...
Unpacking replacement gnome-user-guide ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Setting up initramfs-tools (0.98.8ubuntu3.1) ...
update-initramfs: deferring update (trigger activated)
cp: cannot create regular file `/cdrom/casper/initrd.gz.new': No such file or directory
dpkg: error processing initramfs-tools (--configure):
 subprocess installed post-installation script returned error exit status 1