package:firefox-locale-or:49.0.2+build2-0ubuntu0.16.04.2
Preparing to unpack .../firefox_49.0.2+build2-0ubuntu0.16.04.2_amd64.deb ...
dpkg (subprocess): unable to execute old pre-removal script (/var/lib/dpkg/info/firefox.prerm): Permission denied
dpkg: warning: subprocess old pre-removal script returned error exit status 2
dpkg: trying script from the new package instead ...
dpkg (subprocess): unable to execute new pre-removal script (/var/lib/dpkg/tmp.ci/prerm): Permission denied
dpkg: error processing archive /var/cache/apt/archives/firefox_49.0.2+build2-0ubuntu0.16.04.2_amd64.deb (--unpack):
 subprocess new pre-removal script returned error exit status 2