I think this bug are also related to the following bugs: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/539219 https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/579110
I have read the source codes of APT, Synaptic, software-properties, software-properties-gtk and Python-apt and I think you have to mount the CD/DVD to /cdrom/ because of this line: string CDROM = _config->FindDir("Acquire::cdrom::mount", "/cdrom/") This code can be found in: Synaptic package: rcdscanner.cc and apt package: apt-pkg/cdrom.cc And the meaning of this line is: If the value of the key "Acquire::cdrom::mount" is empty, then "/cdrom/" will be used. That's why sometimes you have to create the symbolic link for "/cdrom/". Well, for a normal user, how to assign the mount point to the key "Acquire::cdrom::mount"? Now, I have found two ways: In the console, run: 1. sudo synaptic --add-cdrom {mount point}. For example, sudo synaptic --add-cdrom /media/APTonCD/ OR 2. sudo apt-cdrom add --auto-detect At this moment, I don't know why the value of the key "Acquire::cdrom::mount" becomes empty. Also, for me, I could not submit any patch because I am not familiar with Python language. Therefore, I wish my report can help someone to solve this problem. -- apt-cdrom fails due to inconsistent choice of mount points https://bugs.launchpad.net/bugs/602945 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