package postfix 2.6.5-3 failed to install/upgrade:

Thank you for taking the time to report this bug and helping to make Ubuntu better. Unfortunately, we can't fix it because your description didn't include enough information. You may find it helpful to read "How to report bugs effectively" http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful if you would then provide a more complete description of the problem. We have instructions on debugging some types of problems at http://wiki.ubuntu.com/DebuggingProcedures.
At a minimum, we need:
1. the specific steps or actions you took that caused you to encounter the problem,
2. the behavior you expected, and
3. the behavior you actually encountered (in as much detail as possible).
Thanks!

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This is not related to Thunderbird Changed package to postfix. I'm not sure what more info the reporter can give, I haven't looked in the logs below but all info should be in there, also the following should help (not in English so i can be sure what it says:

ErrorMessage:
 ErrorMessage: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück

I'm fairly sure the logs are going to be the same lang.

It looks like the installation process has been abruptly interrupted. Did your system crashed ?

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future.
To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New".
Thanks again!