You should purge before reinstalling the package:
sudo apt-get purge tomcat6
sudo apt-get install tomcat6
Please reopen if that doesn't solve it for you.
** Changed in: tomcat6 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/706054
Title:
package tomcat6 6.0.24-2ubuntu1.5 failed to install/upgrade: sub-
processo script post-installation instalado retorno