It looks like the CD is corrupted. Input/output error is not a dpkg bug but a hardware problem.
dpkg-split: error: error reading /cdrom//pool/restricted/s/sl-modem/sl- modem-daemon_2.9.11~20100718-4_amd64.deb: Input/output error dpkg: error processing /cdrom//pool/restricted/s/sl-modem/sl-modem- daemon_2.9.11~20100718-4_amd64.deb (--unpack): subprocess dpkg-split returned error exit status 2 ** Changed in: dpkg (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/852797 Title: package sl-modem-daemon 2.9.11~20100718-2 failed to install/upgrade: ErrorMessage: package sl-modem-daemon is already installed and configured To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/852797/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs