quick installation error

Hey there,

im pretty new to the joomla and its template business, but i am very
confident when it comes to linux and webservers.

Nevertheless i cant get a quick installation of the post_note template
to run. I have a clean Ubuntu 11.10 (i tried it with a clean 10.4 as well),
newest php5, newest mysql and newest apache webserver. I install the
package without any problems => Joomla telling me everything is fine.
After installation i delete installation directory and create the configuration.php

When i try to access the page then i get a blank white page. The administrator
page does show up though. After looking into the error log from apache i get the
following lines:

[Sun Nov 27 23:10:24 2011] [error] [client 91.15.70.145] PHP Notice: Undefined variable: is_excluded in /var/www/wiki/templates/gk_postnote/lib/gk.framework.php on line 711
[Sun Nov 27 23:10:24 2011] [error] [client 91.15.70.145] PHP Notice: Undefined variable: is_excluded in /var/www/wiki/templates/gk_postnote/lib/gk.framework.php on line 729
[Sun Nov 27 23:10:24 2011] [error] [client 91.15.70.145] PHP Notice: Undefined variable: is_excluded in /var/www/wiki/templates/gk_postnote/lib/gk.framework.php on line 744
[Sun Nov 27 23:10:24 2011] [error] [client 91.15.70.145] PHP Notice: Undefined variable: is_excluded in /var/www/wiki/templates/gk_postnote/lib/gk.framework.php on line 753
[Sun Nov 27 23:10:24 2011] [error] [client 91.15.70.145] PHP Notice: Undefined variable: is_excluded in /var/www/wiki/templates/gk_postnote/lib/gk.framework.php on line 758

I tried this on two different ubuntu installations (10.4lts and 11.10). Nothing changed. Can anybody help me with that? The standart template etc. is working fine. All data is showing up in backend.

best regards,
Markus

This are notice messages even not warnings. You need to disable displaying errors in your PHP configuration or ask your service provider about it if you don't have access to php.ini file.

Ok, so i ignore the messages. I think there is no need to disable the error logging. The server is fully mine and i can edit everything if needed.

Nevertheless. I still have a blank white page when accessing 194.95.66.126:8080/wiki/
Administratorpage and other templates are working fine. What can i do to find the error?