Since Parity has been replaced by OpeneThereum, I tried to install OpeneThereum, but got an error, so I wrote down a workaround.
I referred to the following page.
Latest Rust version compiles main branch went error #547
And I'm using WSL2 and Ubuntu18.04.
command
curl https://sh.rustup.rs -sSf | sh -s -- -y
sudo apt install clang cmake
source ~/.cargo/env # you may add to .bashrc
rustup override set 1.51.0 # IMPORTANT!!
git clone https://github.com/openethereum/openethereum
cd openethereum
cargo clean
cargo build --release --features final