It looks like your root (/) filesystem on this usb stick was full and that's why the package installation was failing. I'm setting this bug report to Invalid since there isn't much we can do about and since you've sorted it out with another usb stick.
** Changed in: man-db (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/732649 Title: package man-db 2.5.7-2ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs