Comment 3 for bug 640121

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Scott Moser (smoser) wrote : Re: package dovecot-imapd 1:1.2.9-1ubuntu6.1 failed to install/upgrade: dependency problems - leaving unconfigured

Its my guess that this install failed because of the following line in dovecot's post install:
    MAILNAME=`cat /etc/mailname 2> /dev/null || hostname -f`

as seen in the dpkg log, 'hostname` failed. Do you have any idea why that would have occurred ?

does running 'hostname' succeed for you now?