mjhjmtu

I tried really hard to figure out the solution but whenever I type apt-get update I get:

Hit:1 http://packages.microsoft.com/repos/vscode stable InRelease 
Get:2 https://download.virtualbox.org/virtualbox/debian vivid InRelease [7,140 B]
Err:2 https://download.virtualbox.org/virtualbox/debian vivid InRelease
The following signatures were invalid: 7B0FAB3A13B907435925D9C954422A4B98AB5139
Err:3 http://repo.kali.org/kali kali-rolling InRelease
403 Forbidden

Reading package lists... Done

W: GPG error: https://download.virtualbox.org/virtualbox/debian vivid InRelease: The following signatures were invalid: 7B0FAB3A13B907435925D9C954422A4B98AB5139

E: The repository 'https://download.virtualbox.org/virtualbox/debian vivid InRelease' 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.

W: Target Packages (contrib/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

W: Target Packages (contrib/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

W: Target Translations (contrib/i18n/Translation-en_GB) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

W: Target Translations (contrib/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

W: Target DEP-11 (contrib/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

W: Target DEP-11 (contrib/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

W: Target DEP-11-icons (contrib/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list.d/virtualbox.list:1

My sources.list file contains:

#The Kali Repository

# deb cdrom:[Debian GNU/Linux 2017.3 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 20171109-13:49]/ kali-rolling contrib main non-free

#deb cdrom:[Debian GNU/Linux 2017.3 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 20171109-13:49]/ kali-rolling contrib main non-free



deb http://repo.kali.org/kali kali-rolling main contrib non-free

# deb-src http://repo.kali.org/kali kali-rolling main contrib non-free

I researched really hard and did many online fixes but nothing happened.

Can somebody please suggest a fix to this? Thank you.

It seems like you have more than one issue currently. Your original issue seems to have been lack of a correct gpg signature. If you are prepared to trust the site, navigate to the url at the error message, ie. https://download.virtualbox.org/virtualbox/debian, where you will see three *.asc files. Try running apt-key add on the one for the package you are using.

A second issue you seem to be having is that you are using an incorrect url, ie. http://repo.kali.org/kali for something.

A third issue is that you seem to have some form of duplication on line 13 of your sources.list file. If it isn't too long, please post it.

Finally, there does exist an official kali linux forum website https://forums.kali.org/ that might be helpful for you to join.