Hi ,
please follow the instructions to resolve your problem.
Open a terminal (CTRL+ALT+T keys combo) and write
Code:
gksudo gedit /etc/apt/sources.list
At the opened window , search and find any line (search in the begin of the file , I think they are the first 3 lines) begins with this
Code:
deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_
and make them like this
Code:
# deb cdrom:[Ubuntu 12.04.1 LTS _Precise Pangolin_
add this symbol at the begin of each line #
save the file and run in terminal
Code:
sudo apt-get update
sudo apt-get dist-upgrade
Thanks
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