AppArmor is a security layer similar to SELinux, which controls access to various system resources. Sometimes this can prevent ThinLinc from working properly, so the installer will give you the option to configure it automatically.
You should have the option to skip this step if it is failing. But this may result in AppArmor blocking some ThinLinc operations.
If you’re unable to post the logfile here, it may be because your account is too new. Please send it through to support@cendio.com instead, and we can have a look for you.