Preparing to unpack .../linux-image-extra-4.4.0-31-generic_4.4.0-31.50~14.04.1_amd64.deb ...
Unpacking linux-image-extra-4.4.0-31-generic (4.4.0-31.50~14.04.1) ...
Setting up linux-signed-image-4.4.0-31-generic (4.4.0-31.50~14.04.1) ...
cp: error writing ‘/boot/vmlinuz-4.4.0-31-generic.efi.signed’: No space left on device
cp: failed to extend ‘/boot/vmlinuz-4.4.0-31-generic.efi.signed’: No space left on device
dpkg: error processing package linux-signed-image-4.4.0-31-generic (--configure):
 subprocess installed post-installation script returned error exit status 1