When I run
sudo apt-get update to update the system I get this error on the bottom of the console:
W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3 W: The repository 'https://repo.skype.com/deb stable InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details.
What's going wrong with Skype? Is there any risk since the error says that the Skype repo is dangerous to use?
I use Ubuntu 16.04.