Bug#660669: lenny->squeeze: Upgrading locales causes broken en_US.utf8 locale during upgrade

[Josh Triplett <josh@joshtriplett.org>]

Package: upgrade-reports
Severity: normal

I just upgraded an old system from lenny to squeeze.  The upgrade run
included the "locales" package.  Early on in the upgrade, apt unpacked
the replacement locales, but didn't actually configure it at that time.
Throughout the rest of the upgrade, I got numerous different and
repeated messages about broken locales, such as these:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LC_COLLATE = "C",
        LANG = "en_US.utf8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
/usr/bin/mandb: can't set the locale; make sure $LC_* and $LANG are correct
manconv: can't set the locale; make sure $LC_* and $LANG are correct
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

Please make sure that upgrading the locales package does not break
configured locales during the upgrade.

Thanks,
Josh Triplett