Preparing to unpack .../libcairo2_1.13.0~20140204-0ubuntu1.1_amd64.deb ...
Unpacking libcairo2:amd64 (1.13.0~20140204-0ubuntu1.1) over (1.13.0~20140204-0ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/libcairo2_1.13.0~20140204-0ubuntu1.1_amd64.deb (--unpack):
 unable to securely remove '//..dpkg-tmp': Read-only file system
Preparing to unpack .../thunderbird_1%3a31.4.0+build1-0ubuntu0.14.04.1_amd64.deb ...
Unpacking thunderbird (1:31.4.0+build1-0ubuntu0.14.04.1) over (1:31.3.0+build1-0ubuntu0.14.04.1) ...
dpkg: error processing archive /var/cache/apt/archives/thunderbird_1%3a31.4.0+build1-0ubuntu0.14.04.1_amd64.deb (--unpack):
 unable to securely remove '/etc/thunderbird/syspref.js.dpkg-new': Read-only file system
Preparing to unpack .../libcairo-gobject2_1.13.0~20140204-0ubuntu1.1_amd64.deb ...
Unpacking libcairo-gobject2:amd64 (1.13.0~20140204-0ubuntu1.1) over (1.13.0~20140204-0ubuntu1) ...
dpkg: error processing archive /var/cache/apt/archives/libcairo-gobject2_1.13.0~20140204-0ubuntu1.1_amd64.deb (--unpack):
 unable to securely remove '//..dpkg-tmp': Read-only file system