The reason it failed because "1420" is not a valid hostname.
Regards
chuck
** Changed in: postfix (Ubuntu)
Status: Incomplete => Won't Fix
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package postfix 2.5.5-1.1 failed to install/upgrade: el subproceso
post-installation script devolvió el código de salida de error 75
https://bugs.launchpad.net/bugs/550965
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