I attempted yo upgrade my server and get this reeoe

[keith@ubuntuserver ~]# sudo apt update && sudo apt install -y --only-upgrade tor

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Get:2 https://deb.torproject.org/torproject.org bionic InRelease [4,244 B]
Get:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:4 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:5 http://archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Err:2 https://deb.torproject.org/torproject.org bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74A941BA219EC810
Reading package lists...
W: GPG error: https://deb.torproject.org/torproject.org bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74A941BA219EC810
E: The repository 'https://deb.torproject.org/torproject.org bionic InRelease' is not signed.
[keith@ubuntuserver ~]#

Thanks

Keith

On 08/28/2019 11:53 PM, Roger Dingledine wrote:
Hi,

You are running a fast Tor relay, which is great:
http://rougmnvswfsmd4dq.onion/rs.html#details/2D82EF77EB07AF2B3B1BC140AAB5278E3963D64E

But that Tor version is obsolete, and because of old bugs, we will soon
cut relays running those versions out of the network. Please consider
upgrading!

The Tor 0.3.5 long-term-stable branch will be maintained until Feb 2022:
https://trac.torproject.org/projects/tor/wiki/org/teams/NetworkTeam/CoreTorReleases#Current
and you can see the lifetimes of other Tor versions on that table too.

You can find Tor packages for your distro / OS here:
https://trac.torproject.org/projects/tor/wiki/TorRelayGuide#PlatformspecificInstructions

Let us know if we can do anything to make the process easier.

And lastly, I am cc'ing the new network health mailing list (which
has public archives), to help us stay synced:
https://trac.torproject.org/projects/tor/wiki/org/teams/NetworkHealthTeam

Thanks!
--Roger