I'm trying to install Firefox on Ubuntu 20.04 (running under WSL2). When I try sudo apt install firefox
I get error:
Err:1 http://security.ubuntu.com/ubuntu focal-updates/main amd64 firefox amd64 85.0+build1-0ubuntu0.20.04.1
404 Not Found [IP: 91.189.88.152 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_85.0+build1-0ubuntu0.20.04.1_amd64.deb 404 Not Found [IP: 91.189.88.152 80]
I've been able to install other packages, so I don't think the repository is misconfigured.
What to do?