1. Open terminal
2. Run the following command to check if “deb http://http.kali.org/kali kali-rolling main non-free contrib” is present in the file. Note. Before http: //http.kali… There must be no hash symbol #, otherwise it is commented out, which means it is not equal there at all = it won’t work, go to step 3
3. If not, run the following command to add it
echo "deb http://http.kali.org/kali kali-rolling main non-free contrib" | sudo tee /etc/apt/sources.list
4. Update Kali Linux, run the following command
sudo apt update && sudo apt -y full-upgrade
Note If you encounter an error at this point, try using https instead of http.
5. Reboot the system
6. After that check the current version (your output should match the following if the update was successful), use the following:
grep VERSION /etc/os-release
VERSION="2020.3" VERSION_ID="2020.3" VERSION_CODENAME="kali-rolling"
1 SMP Debian 5.7.6-1kali2 (01.07.2020)