I have the 16.04 OSMC repositories registered as detailed for ubuntu here (OSMC official).
I am currently unable to update as it seems the key has expired:
Err:11 http://download.opensuse.org/repositories/home:/osmc/xUbuntu_16.04 Release.gpg
The following signatures were invalid: EXPKEYSIG 8873E7BF70F1BBEA home:osmc OBS Project <home:osmc@build.opensuse.org>
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.opensuse.org/repositories/home:/osmc/xUbuntu_16.04 Release: The following signatures were invalid: EXPKEYSIG 8873E7BF70F1BBEA home:osmc OBS Project <home:osmc@build.opensuse.org>
W: Failed to fetch http://download.opensuse.org/repositories/home:/osmc/xUbuntu_16.04/Release.gpg The following signatures were invalid: EXPKEYSIG 8873E7BF70F1BBEA home:osmc OBS Project <home:osmc@build.opensuse.org>
I’ve seen this problem reported a few time and I have tried updating the key but to no avail. Does anyone know how to fix this?