Hi Gary, I removed the package from the apt cache before I tried to reinstall and verified that software-center actually starts the download.
I tried with software-center several times and switched to a wired network to rule out networking problems just to be sure but it always failed. I also ran an apt-get update to refresh the package cache but the "untrusted source" error remained. I found out that the "Method CreateItem failed" error came from the installation of GNOME3 from a ppa and resulting incompatible packages for ubuntu single sign on which I was able to fix by installing a patched "ubuntu-sso-client" package however this did not fix the untrusted package source issue. It looks to me like the issue was that somehow apt lost the signatures of at least the ppa with the purchased software and somehow even an apt- get update did not refresh that signature. Maybe even that ppa itself was defective by the time I tried the installation as the first run of "apt-get install" had a package size missmatch - something I find rather unusual. Thanks again, /Arne -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/803363 Title: Bought software fails to install To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/803363/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs