Thanks to everyone who reported this bug - I think I've found where the problem is. If something interrupts the download of the content from sandboxgamemaker.com, and then installation is restarted, Ubuntu will try to unzip and install the partially downloaded file instead of the full file.
The fix is currently migrating through Debian and Ubuntu Oneiric. Once fixed there I'll turn this into an SRU for natty. for now here's a workaround: $ sudo rm -r /var/cache/sandboxgamemaker You should be able to run "dpkg --configure -a" or install sandboxgamemaker ** Changed in: sandboxgamemaker (Ubuntu) Status: Incomplete => Triaged ** Changed in: sandboxgamemaker (Ubuntu) Importance: Undecided => Medium ** Changed in: sandboxgamemaker (Ubuntu) Importance: Medium => Low -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/755641 Title: package sandboxgamemaker 2.6.1 dfsg-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 9 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs