Jika anda temukan error:

Err:1 http://deb.debian.org/debian bullseye InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131 NO_PUBKEY 605C66F00D6C9793

Maka cara perbaikan cukup dengan menambahkan PUBKEY tersebut:

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9 6ED0E7B82643E131 

Have a nice day!