Running Ubuntu 19.04. Ran apt update today, and received the GPG error described above with regards to the signature being invalid.
Have already tried everything identified in this thread, including the last one from 14 July 2019 suggesting direct removal of the apt-key. Deleted plexmediaserver.list from /etc/apt/sources.list.d/, then re-enabled the repository following the instructions in https://support.plex.tv/articles/235974187-enable-repository-updating-for-supported-linux-server-distributions/
Still receiving the GPG error stating that the signature is invalid.
The output of sudo apt-key list:
pub rsa4096 2015-03-22 [SC]
CD66 5CBA 0E2F 88B7 373F 7CB9 9720 3C7B 3ADC A79D
uid [ unknown ] Plex Inc.
sub rsa4096 2015-03-22 [E]
I saw the note from Chuck above stating that [unknown] should never show, and that the key is corrupt, but I’ve deleted it completely 6 separate times, and the freshly-downloaded key shows [ unknown] every time. I’ve even gone so far as to restart the computer (despite not being necessary), and have had no luck.
I also just discovered on Failed to fetch https://downloads.plex.tv/repo/deb/dists/public/Release.gpg The following signatures were invalid that Chuck has alerted the Build team. (Repo custodians).
I suppose I should just wait now.
