I followed those steps as https://pkg.cloudflareclient.com/ says.


Add cloudflare gpg key

Code: 

curl https://pkg.cloudflareclient.com/pubkey.gpg | sudo gpg --yes --dearmor --output /usr/share/keyrings/cloudflare-warp-archive-keyring.gpg

Add this repo to your apt repositories

Code: 

echo "deb [arch=amd64 signed-by=/usr/share/keyrings/cloudflare-warp-archive-keyring.gpg] https://pkg.cloudflareclient.com/ $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/cloudflare-client.list

Install

Code: 

sudo apt-get update && sudo apt-get install cloudflare-warp

warp-cli register