On Ubuntu 21.04, when I run
sudo apt update --allow-unauthenticated
I'm getting errors saying the repository has no release file and updating from such a repository can't be done securely and is therefore disabled by default. All my sources in /etc/apt/sources.list are like
deb [allow-insecure=yes,trusted=yes] http://us.archive.ubuntu.com/ubuntu hirsute main restricted
I've tried just [allow-insecure=yes] and just [trusted=yes] as well and get the same error. How can I update?