Thank you 1455 for your reply and advice!
Yesterday I installed Ubuntu 18.04 LTS and tried to run the scripts separately one after the other. As far as I could see everything went fine.. then while running "5_build_openpliPC" some errors occured and the script stopped. Unfortunately I didn't copy the whole errormessages but the errors were in section "dvbsoftwareca" and sayed something like old functions weren't found or used anymore. Something like: ca_descr-t not found, please use caddr_t.. Do you have an idea why this problem occured?
After that I installed Ubuntu 16.04.4 and tried again. This time I was unable to build 3_build_libxine.sh. In my opinion it's not possible to clone xine-lib-1.2-vdpau from the repository: https://anonscm.debian.org/hg/xine-lib
Your post yesterday would confirm that. What can I you now? Do we have to wait until it's online again or is there a workaround or another source to clone xine-lib-1.2-vdpau?
And in general, which ubuntu version would you recommend my to get e2pc running? Does it run on 16.04 with Kernel 4.13?
And yes, I'm sill working on learning the basics..