$ sudo apt-get update
Hit:1 http://us-east-1.ec2.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://security.ubuntu.com/ubuntu focal-security InRelease
.....
Hit:11 http://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 Release
Ign:9 https://packages.erlang-solutions.com/ubuntu focal Release.gpg
Reading package lists...
W: GPG error: https://packages.erlang-solutions.com/ubuntu focal Release: The following signatures were invalid: BADSIG D208507CA14F4FCA Erlang Solutions Ltd. <packages@erlang-solutions.com>
E: The repository 'https://packages.erlang-solutions.com/ubuntu focal Release' is not signed.
The command "sudo apt-get update" failed and exited with 100 during .
Seems to be working now
Nope, broken again