‘The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131 NO_PUBKEY 605C66F00D6C9793’
type this command using root account:
gpg –keyserver hkp://keyserver.ubuntu.com –recv-keys 0E98404D386FA1D9 6ED0E7B82643E131 605C66F00D6C9793
gpg –armor –export 0E98404D386FA1D9 6ED0E7B82643E131 605C66F00D6C9793 | sudo apt-key add –