Repository updating reports a Warning

Ubuntu: Server 18.04.1 LTS
Server Version#: 1.13.6.5339-115f087d6

When I try to update plex through the repository a warning is returned:

W: Conflicting distribution: https://downloads.plex.tv/repo/deb public InRelease (expected public but got )

I’ve just completed a fresh install of Ubuntu Server, 18.04.1 LTS and installed Plex Server 1.13.6.5339-115f087d6. I then followed the guide to enable updates theough the repository: https://support.plex.tv/articles/235974187-enable-repository-updating-for-supported-linux-server-distributions/

On running sudo apt-get update I get the following:

###@plex-server:~$ sudo apt-get update
Hit:1 Index of /ubuntu bionic InRelease
Get:2 Index of /ubuntu bionic-security InRelease [83.2 kB]
Hit:3 https://downloads.plex.tv/repo/deb public InRelease
Get:4 Index of /ubuntu bionic-updates InRelease [88.7 kB]
Fetched 172 kB in 0s (481 kB/s)
Reading package lists… Done
W: Conflicting distribution: https://downloads.plex.tv/repo/deb public InRelease (expected public but got )

Any thought/help appreciated.

Kindly search for and read the many threads on this topic.

As explained in all the other threads, it is a WARNING only and of no consequence.
Apt now expects a header entry which the current repository updater does not write.
When the new repositories are deployed, the error will no longer appear.