The casper package is a component of the livefs, and is not meant to be installed on an installed system. The casper initramfs hook has been fixed in the version of the package in 12.04, but at the time this error occurred you still had the 10.04 version of casper installed.
** Changed in: initramfs-tools (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1096534 Title: package initramfs-tools 0.99ubuntu13 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1096534/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs