In sources.list I just have to uncomment line 79 (deb http://ftp.de.debian.org/debian sid main) and the error shows up. If I remove other reps, line 79 wont be a problem anymore and it works as expected.
in /etc/apt/sources.list.d/ there are only the two files named "playdeb.list" and "playdeb.list.save" with identical content: deb mirror://www.getdeb.net/playdeb-mirror/hardy/// hardy/ ** Attachment added: "sources.list" http://launchpadlibrarian.net/18409137/sources.list -- E: Wow, you exceeded the number of descriptions this APT is capable of. https://bugs.launchpad.net/bugs/280660 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs