It was some faulty hardware issue (probably when downloading the package). I downloaded the package from http://packages.ubuntu.com/ and when running dpkg -i with the new downloaded package all was good.
** Changed in: powernowd (Ubuntu) Status: New => Invalid -- package powernowd 1.00-1ubuntu5 failed to install/upgrade: subprocess installed post-installation script returned error exit status 2 https://bugs.launchpad.net/bugs/569834 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