I am trying to upgrade Kali Linux from 2017.2 to 2018.2 using an iso mounted in the Kali Virtual Machine.
So, what I did was I edited my
sources.list file to:
deb file:///media/cdrom0 kali-rolling main contrib non-free
and commented other lines using #.
Now, whenever I try
apt-get update, I get:
E: The repository 'file:/media/cdrom0 kali-rolling Release' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.