Fix Update and Upgrade Problems in Kali Linux

The three commands

1. update refreshes the package list from the repositories:

sudo apt update

1. upgrade installs newer versions of installed packages:

sudo apt upgrade

1. dist-upgrade (or full-upgrade) also adds and removes packages when needed. Kali needs it for many updates:

sudo apt dist-upgrade

Common problems and fixes

Wrong repository settings

Open the file:

sudo nano /etc/apt/sources.list

For Kali it should contain:

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

Network problems

ping -c 4 google.com

If it fails, fix your connection or DNS first.

Broken packages

sudo apt-get check
sudo apt-get install -f

GPG key errors

A message like "The following signatures couldn't be verified" means the archive key is old. Download the current key:

sudo wget https://archive.kali.org/archive-keyring.gpg -O /usr/share/keyrings/kali-archive-keyring.gpg

Not enough disk space

df -h

Free space with:

sudo apt-get clean && sudo apt-get autoremove

More troubleshooting

Use another mirror. Edit sources.list and point to another official mirror.

Install a package by hand. Download the .deb file and install it:

sudo dpkg -i package_name.deb

Best practices

• Update often, so updates stay small.
• Back up important data before a big upgrade.
• Use only official Kali repositories.
• Keep an eye on disk space.

Quick recap

• Check sources.list, network, keys and disk space.
• Use apt-get install -f for broken packages.
• Update often.