At the time of installation , sudo apt-get install -y python-pip this error is occured. I have seen the solution on askubuntu that just comment out the single line as shown in below the problem. Please anybody know about it ? Thanks in advance.

January 19, 2015 2.6k views

Media change: please insert the disc labeled
'Ubuntu 14.04 LTS Trusty Tahr - Release amd64 (20140417)'
in the drive '/media/cdrom/' and press enter

Solution on askubuntu
The issue is fairly simple, you have the CDROM entry in your /etc/apt/sources.list. Just remove/comment out the line, and you will be fine:

sudo sed -i '/cdrom/d' /etc/apt/sources.list

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