Hi,

is this the right place for this message?

Err:5 https://pkgs.tdrnetworks.com/apt/devuan chimaera InRelease
  The following signatures were invalid: EXPKEYSIG 1CC02413BFF88108 TDR Networks Builder <builder@tdrnetworks.com>
Hit:6 http://deb.devuan.org/merged chimaera-backports InRelease
Reading package lists... Done
W: GPG error: https://pkgs.tdrnetworks.com/apt/devuan chimaera InRelease: The following signatures were invalid: EXPKEYSIG 1CC02413BFF88108 TDR Networks Builder <builder@tdrnetworks.com>
E: The repository 'https://pkgs.tdrnetworks.com/apt/devuan chimaera InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.