I had the same issue, can be fixed by creating the following file: sudo gedit /etc/apt/apt.conf.d/99iso
With the contents: Acquire::cdrom::AutoDetect "false"; Acquire::cdrom::mount "/mnt"; APT::CDROM::NoMount "true"; Now apt-cdrom with the above parameters works. ** Changed in: apt (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/957619 Title: apt-cdrom ignores command line options, won't access non cdrom To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/957619/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs