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
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