Err:3 http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu bionic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1E9377A2BA9EF27F
W: GPG error: http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1E9377A2BA9EF27F
E: The repository 'http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu bionic InRelease' is not signed.
Currently GHA fails on Ubuntu 18.04 with