I am trying to install ChirpStack Gateway Bridge in Ubuntu 18.04LTS and come up with this problem when i run the command “sudo apt update”
W: GPG error: https://artifacts.chirpstack.io/packages/3.x/deb stable InRelease: The following signatures were invalid: EXPKEYSIG CFF064C9D12ECB34 Orne Brocaar
E: The repository ‘https://artifacts.chirpstack.io/packages/3.x/deb stable InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
hp14@hp14-VB:~$ sudo apt install chirpstack-gateway-bridge
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package chirpstack-gateway-bridge
Could anyone help me please? Thank you!