$ sudo bash -x /etc/kernel/postinst.d/initramfs-tools 3.0.0-16-generic /boot/vmlinuz-3.0.0-16-generic
+ version=3.0.0-16-generic
+ bootopt=
+ '[' -z 3.0.0-16-generic ']'
+ '[' -n '' ']'
+ '[' -n /boot/vmlinuz-3.0.0-16-generic ']'
++ dirname /boot/vmlinuz-3.0.0-16-generic
+ bootdir=/boot
+ bootopt='-b /boot'
+ '[' -n '' ']'
+ INITRAMFS_TOOLS_KERNEL_HOOK=1
+ update-initramfs -c -t -k 3.0.0-16-generic -b /boot
update-initramfs: Generating /boot/initrd.img-3.0.0-16-generic
/usr/sbin/mkinitramfs: line 355: : No such file or directory
E: mkinitramfs failure find 141 cpio 141 gzip 1
update-initramfs: failed for /boot/initrd.img-3.0.0-16-generic with 1.