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After adding the key, you must ensure your source list points to it correctly. Open your Docker list file: sudo nano /etc/apt/sources.list.d/docker.list Use code with caution. Update the line to include the signed-by attribute:
Sometimes a corrupted cache causes the signature error. Clear it before trying to update again: After adding the key, you must ensure your
If you are using a derivative like Linux Mint , the $(lsb_release -cs) command might return a name (like sarah or serena ) that Docker doesn't recognize, requiring you to manually point it to xenial . Clear it before trying to update again: If
sudo mkdir -p /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg sudo chmod a+r /etc/apt/keyrings/docker.gpg Use code with caution. ( Ask Ubuntu , Stack Overflow ). 2. Update the Repository Configuration Stack Overflow ).
deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu xenial stable Use code with caution. ( Docker Forums ). 3. Clear Apt Cache and Update
The most common cause is that the official Docker public key hasn't been added to your system.