Fetched 31.2 MB in 3min 27s (151 kB/s)
Selecting previously unselected package firefox-mozilla-build.
(Reading database ... 329461 files and directories currently installed.)
Unpacking firefox-mozilla-build (from .../firefox-mozilla-build_27.0.1-0ubuntu1_amd64.deb) ...
dpkg-divert: error: `diversion of /usr/bin/firefox to /usr/bin/firefox.ubuntu by firefox-mozilla-build' clashes with `diversion of /usr/bin/firefox to /usr/bin/firefox.real by iceweasel'
dpkg: error processing /var/cache/apt/archives/firefox-mozilla-build_27.0.1-0ubuntu1_amd64.deb (--unpack):
subprocess new pre-installation script returned error exit status 2
dpkg-divert: error: mismatch on divert-to
when removing `diversion of /usr/bin/firefox to /usr/bin/firefox.ubuntu by firefox-mozilla-build'
found `diversion of /usr/bin/firefox to /usr/bin/firefox.real by iceweasel'
dpkg: error while cleaning up:
subprocess new post-removal script returned error exit status 2
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)