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what happened here.

installArchives() failed: (Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
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(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
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(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 133653 files and directories currently installed.)
Preparing to replace firefox-branding 3.6.14~hg20110119r34882+nobinonly-0ubuntu1~umd1~maverick (using .../firefox-branding_3.6.14~hg20110121r34884+nobinonly-0ubuntu1~umd1~maverick_i386.deb) ...
Unpacking replacement firefox-branding ...
Preparing to replace firefox 3.6.14~hg20110119r34882+nobinonly-0ubuntu1~umd1~maverick (using .../firefox_3.6.14~hg20110121r34884+nobinonly-0ubuntu1~umd1~maverick_i386.deb) ...
Unpacking replacement firefox ...
Preparing to replace xulrunner-1.9.2 1.9.2.14~hg20110119r34882+nobinonly-0ubuntu1~umd1~maverick (using .../xulrunner-1.9.2_1.9.2.14~hg20110121r34884+nobinonly-0ubuntu1~umd1~maverick_i386.deb) ...
Unpacking replacement xulrunner-1.9.2 ...
Processing triggers for desktop-file-utils ...
Setting up firefox-4.0-core (4.0~b10~hg20110120r60909+nobinonly-0ubuntu1~umd1~maverick) ...
update-alternatives: error: alternative path /usr/bin/firefox-4.0 doesn't exist.
dpkg: error processing firefox-4.0-core (--configure):
subprocess installed post-installation script returned error exit status 2
Setting up xulrunner-1.9.2 (1.9.2.14~hg20110121r34884+nobinonly-0ubuntu1~umd1~maverick) ...
update-alternatives: using /usr/bin/xulrunner-1.9.2 to provide /usr/bin/xulrunner (xulrunner) in auto mode.
Setting up firefox-branding (3.6.14~hg20110121r34884+nobinonly-0ubuntu1~umd1~maverick) ...
Setting up firefox (3.6.14~hg20110121r34884+nobinonly-0ubuntu1~umd1~maverick) ...
Please restart all running instances of firefox, or you will experience problems.
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
firefox-4.0-core
Setting up firefox-4.0-core (4.0~b10~hg20110120r60909+nobinonly-0ubuntu1~umd1~maverick) ...
update-alternatives: error: alternative path /usr/bin/firefox-4.0 doesn't exist.
dpkg: error processing firefox-4.0-core (--configure):
subprocess installed post-installation script returned error exit status 2