Comment 5 for bug 1920640

Just to make the current status clear from what I can gather:

- The GPG key was extended by 1 year to 2022-03-21

- On Ubuntu Bionic (18.04) and newer the GPG key is normally installed by the ubuntu-dbgsym-keyring package (on 18.04 Bionic onwards). This package is not yet updated. An update to this package is required and still pending.

- On Ubuntu Xenial (16.04) users typically imported the key from keyserver.ubuntu.com. As that is not yet updated, you will need to import the key from HTTP using the workaround below which will work as a temporary workaround on all Ubuntu releases. Once keyserver.ubuntu.com is updated, you could also use "sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F2EDC64DC5AEE1F6B9C621F0C8CAB6595FDFF622"

- The updated GPG key is not currently published to keyserver.ubuntu.com

- The updated GPG key is available at http://ddebs.ubuntu.com/dbgsym-release-key.asc

- As a workaround you can import that key to apt using "wget -O - http://ddebs.ubuntu.com/dbgsym-release-key.asc | sudo apt-key add -" (note: you need a space between the -O and -, contrary to the previously pasted comment)

- I believe that the key likely needs to be extended longer and published to all resources including the ubuntu-dbgsym-keyring package and keyserver.ubuntu.com