Re: Tiki was not able to send a test eMail during install
read the documentation about Installation and search at doc.tw.o for ubuntu (there used to be a page with the names of the minimum packages that you needed).
Please, install apache2 and others from the repositories (to get all dependencies satisfied automagically) instead of xampp. This is way much easier (for many users) than going the xampp way.
Hope this helps
Xavi