<span style="color:#323232;"> sudo mount -o loop ~/Downloads/debian-8.0.0-amd64-DVD-1.iso /media/repo_1/
</span><span style="color:#323232;"> sudo mount -o loop ~/Downloads/debian-8.0.0-amd64-DVD-2.iso /media/repo_2/
</span><span style="color:#323232;"> sudo mount -o loop ~/Downloads/debian-8.0.0-amd64-DVD-3.iso /media/repo_3/
</span>
Edit the /etc/apt/sources.list file to add the repository
<span style="color:#323232;">vim /etc/apt/sources.list
</span><span style="color:#323232;">
</span><span style="color:#323232;"> deb file:///media/repo_1/ jessie main contrib
</span><span style="color:#323232;"> deb file:///media/repo_2/ jessie main contrib
</span><span style="color:#323232;"> deb file:///media/repo_3/ jessie main contrib
</span>