[Bug 1522678] Re: package postfix 2.11.0-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 75

[Robie Basak]

>From log:

Setting up postfix (2.11.0-1ubuntu1) ...
/var/lib/dpkg/info/postfix.postinst: 297: [: RG: unexpected operator

Postfix configuration was not changed.  If you need to make changes, edit
/etc/postfix/main.cf (and others) as needed.  To view Postfix configuration
values, see postconf(1).

After modifying main.cf, be sure to run '/etc/init.d/postfix reload'.

Running newaliases
newaliases: warning: valid_hostname: invalid character 32(decimal): RG Linux
newaliases: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: RG Linux
dpkg: error processing package postfix (--configure):
 subprocess installed post-installation script returned error exit status 75

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https://bugs.launchpad.net/bugs/1522678

Title:
  package postfix 2.11.0-1ubuntu1 failed to install/upgrade: subprocess
  installed post-installation script returned error exit status 75

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