Autoware LGSVL fork docker build failed due to "unauthenticated packages"

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You're likely running into #q325039.

Please follow the steps there, run sudo apt update and then try again.

Edit: seeing as this is a Docker build: the author/maintainer of lgsvl/Autoware is not basing his builds on the official OSRF docker images. He's importing the repository keys himself (here fi), which requires updates to the Dockerfiles to use the new key

Note that upstream (ie: autowarefoundation/autoware) has already changed things significantly and might not have this problem (these files).