Hi Seetharam, thanks for taking the time to file this bug and help us
make Ubuntu better.
Your hostname is not valid as a mail host name, so postfix is refusing
to start. This is commonly attributed to a poorly configured cable modem
or router which hands out invalid hostnames with underscores in the
names or numbers as the first characters.
You can verify this by looking at /etc/hostname and /etc/mailname, both
files can be edited to be something more correct for postfix. Once it is
appropriate, 'dpkg --configure -a' should finish configuring postfix.
This is not a bug in postfix though, so closing as Invalid.
** Changed in: postfix (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/934011
Title:
package postfix 2.7.0-1ubuntu0.2 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 75
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