How is it possible to preinstall a reference genome for trackster (hg19) within galaxy.

i tried to find a dedicated help page but could not find any. Could you please link me to relevant information?

See the section titled 'Setup for local instances' on this page: http://wiki.g2.bx.psu.edu/Learn/Visualization

Finally, please send all emails to our mailing lists--in this case, galaxy-dev, which I've cc'd--rather than individual Galaxy developers or other list members. Sending email to the mailing lists ensures that everyone can see and contribute to questions and issues; in addition, emails to mailing lists are tracked and archived so that they are available in the future.