It looks (from your DpkgTerminalLog.txt) like /dev/pts was not set
up inside your chroot.  Can you enter the chroot and do

        mount -t devpts devpts /dev/pts
        chmod 666 /dev/pts/ptmx
        mount --bind /dev/pts/ptmx /dev/ptmx


** Changed in: postfix (Ubuntu)
       Status: New => Incomplete

** Changed in: postfix (Ubuntu)
     Assignee: (unassigned) => Serge Hallyn (serge-hallyn)

-- 
package postfix 2.7.0-1 failed to install/upgrade: subprocess installed 
post-installation script returned error exit status 75
https://bugs.launchpad.net/bugs/597510
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