From the log:
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad
parameter value: homeserver.hsd1.co.comcast.net.
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*** This bug is a duplicate of bug 625023 ***
https://bugs.launchpad.net/bugs/625023
Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 625023, so it is being marked as such. Please look
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https://bugs.launchpad.net/bugs/941547
Title:
package postfix 2.7.0-1ubuntu0.2 failed to install/upgrade: subprocess
installed post-installation script returned
