[Bug 377571] Re: package postfix 2.5.5-1.1 failed to install/upgrade:

[EJ Finneran]

I think this might be a vaild issue under some circumstances but there
is an easy workaround.  I looks like the issue with #5 is that he didn't
put a space between cat and the file path.  I have the same issue with a
fresh install and default settings.

The issue is that for a default install, the installer grabs the full
comcast domain and puts that with a trailing dot in the /etc/hosts (not
sure if that's valid or not) and then by default the postfix package
grabs that hostname as the mail hostname.

Here is the output for me:

gitadmin at ubuntu:~$ postconf myhostname
myhostname = ubuntu.hsd1.il.comcast.net.
gitadmin at ubuntu:~$ cat /etc/hosts
127.0.0.1	localhost
127.0.1.1	ubuntu.hsd1.il.comcast.net.	ubuntu

# The following lines are desirable for IPv6 capable hosts
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
gitadmin at ubuntu:~$ cat /etc/hostname
ubuntu


FIX:

Removing the trailing dot from the myhostname entry in
/etc/postfix/main.cf fixes the issue for me.

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https://bugs.launchpad.net/bugs/377571

Title:
  package postfix 2.5.5-1.1 failed to install/upgrade: