I've installed redmine 0.8.7 on a ubuntu 10.04 LTS without any errors. I can add issues to it but, when it comes to update or even create a quote i get this error from the server on the browser:
An error occurred on the page you were trying to access. If you continue to experience problems please contact your redMine administrator for assistance.
and this on the log file:
Rendering /opt/redmine-0.8.7/public/500.html (500 Internal Server Error