Installation of packages from the Ubuntu CD fails

[Alexandros]

When I try to install a package in 8.10 from the Ubuntu CD using Synaptic Package Manager, it fails.

Steps to reproduce:
1) Enable the check box in Software Updates relevant to the CD and save changes.
2) Insert the CD and wait until it is mounted.
3) Open terminal and type: sudo apt-get install build-essential (That's just an example)
4) Confirm the installation

What happens:
Ubuntu keeps on complaining: Please insert the Ubuntu 8.10 Interpid Ibex CD

What should happen:
The CD should be recognised

Note: This bug is not reproducible on Live CD session.

[Rafik Elouerchefani (rafik)]

Hello.

I'm unsure it's a bug. It could be a wrong CD.
Please try the following :
- Open "Software Sources" (in System>Administration).
- Uncheck the CD-ROM.
- Under "Third-Party Software", click > "Add CD-ROM" and put the CD as asked.
- Try to install the software you need.

[Alexandros (alexandros-t)]

I tried it, but Ubuntu keeps on telling me: "Could not mount CD" (or something similar). The CD I try to use is one I burned with an .iso CD image downloaded via torrent.