Thanks for your report.
The relevant error is
===
chown: invalid user: `postgres'
unable to connect to postgresql server.
error encountered creating user:
Unknown id: postgres
Do you have postgresql installed locally ?
** Changed in: otrs2 (Ubuntu)
Status: New => Incomplete
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package otrs2 2.4.7-1 failed to install/upgrade: subprocess installed
post-installation script returned error exit status 255
https://bugs.launchpad.net/bugs/537984
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