I am wondering if anyone else is getting the following error on Ubuntu 20.04:
W: GPG error: http://apt.insync.io/ubuntu focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY A684470CACCAF35C
E: The repository ‘http://apt.insync.io/ubuntu focal InRelease’ is not signed.
I have retrieved the key (successfully) using:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys ACCAF35C
but no joy. Any tips on how to resolve this would be much appreciated (it seems like many others on Ubuntu 20.04 can update from the repo no problem?)