"Unable to locate package" for exa on WSL 2 Ubuntu
The groovy name is 20.10, not 20.04 LTS. So this package is not available for 20.04 LTS.
But you can install it manually with:
wget -c http://old-releases.ubuntu.com/ubuntu/pool/universe/r/rust-exa/exa_0.9.0-4_amd64.deb
sudo apt-get install ./exa_0.9.0-4_amd64.deb
and test it via:
$ exa --version exa v0.9.0