Comment 1 for bug 288218

That leads to uninstallable packages:

$ sudo apt-get install tomcat6 tomcat6-examples tomcat6-admin tomcat6-user
[...]
Setting up default-jre-headless (1.6-30ubuntu3) ...
Setting up rhino (1.7R1-1ubuntu3) ...

Setting up libaccess-bridge-java (1.24.0-0ubuntu2) ...
Setting up openjdk-6-jre-lib (6b12-0ubuntu4) ...
Setting up libcommons-daemon-java (1.0.2~svn20061127-9ubuntu2) ...

Setting up jsvc (1.0.2~svn20061127-9ubuntu2) ...
Setting up libcommons-collections-java (2.1.1-8ubuntu1) ...

Setting up libcommons-pool-java (1.3-1ubuntu2) ...

Setting up libcommons-dbcp-java (1.2.2-1ubuntu1) ...
Setting up libservlet2.5-java (6.0.18-0ubuntu3) ...
Setting up libtomcat6-java (6.0.18-0ubuntu3) ...
Setting up tomcat6-common (6.0.18-0ubuntu3) ...
Setting up tomcat6 (6.0.18-0ubuntu3) ...
Adding system user `tomcat6' (UID 107) ...
Adding new group `tomcat6' (GID 118) ...
Adding new user `tomcat6' (UID 107) with group `tomcat6' ...
Not creating home directory `/usr/share/tomcat6'.
 * Starting Tomcat servlet engine tomcat6
   ...fail!
invoke-rc.d: initscript tomcat6, action "start" failed.

Setting up tomcat6-admin (6.0.18-0ubuntu3) ...
 * Starting Tomcat servlet engine tomcat6
   ...fail!
invoke-rc.d: initscript tomcat6, action "force-reload" failed.
dpkg: error processing tomcat6-admin (--configure):
 subprocess post-installation script returned error exit status 1
Setting up tomcat6-examples (6.0.18-0ubuntu3) ...
 * Starting Tomcat servlet engine tomcat6
   ...fail!
invoke-rc.d: initscript tomcat6, action "force-reload" failed.
dpkg: error processing tomcat6-examples (--configure):
 subprocess post-installation script returned error exit status 1
Setting up tomcat6-user (6.0.18-0ubuntu3) ...
Setting up openjdk-6-jre-headless (6b12-0ubuntu4) ...
[...]