Package: chromium Version: 39.0.2171.71-1 Preparing to unpack .../chromium_39.0.2171.71-1_i386.deb ... /var/lib/dpkg/tmp.ci/preinst: line 6: upgrade: command not found Unpacking chromium (39.0.2171.71-1) over (38.0.2125.101-3) ...