Upgrading Kali from previous version to Version 2025.3

Problems 

 When running the apt update or apt upgrade in Kali to the latest version the following error asppears. 

 

 To resolve this issue we can perform the following: 

 Get the current version of the OS with the following command. 

 cat /etc/os-release 

 

 1. Download the keyring 

 wget https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_CURRENT_VERSION_all.deb 

 https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_ 2025.1 _all.deb 

 2. Install the keyring 

 sudo dpkg -i kali-archive-keyring_CURRENT_VERSION_all.deb 

 sudo dpkg -i kali-archive-keyring_2025.1_all.deb 

 3. Perform the update  

 sudo apt update -y 

 4. Perform the upgrade 

 sudo apt upgrade -y 

 5. Perform the FULL upgrade 

 sudo apt full-upgrade -y