Preparing to unpack .../libarchive13_3.1.2-11ubuntu0.16.04.2_amd64.deb ...
Unpacking libarchive13:amd64 (3.1.2-11ubuntu0.16.04.2) over (3.1.2-11ubuntu0.16.04.1) ...
Selecting previously unselected package linux-image-4.4.0-31-generic.
Preparing to unpack .../linux-image-4.4.0-31-generic_4.4.0-31.50_amd64.deb ...
Done.
Unpacking linux-image-4.4.0-31-generic (4.4.0-31.50) ...
dpkg: error processing archive /var/cache/apt/archives/linux-image-4.4.0-31-generic_4.4.0-31.50_amd64.deb (--unpack):
 unable to clean up mess surrounding './boot/config-4.4.0-31-generic' before installing another version: Read-only file system