unity

wget -o- https://hub.unity3d.com/linux/keys/public
 
file public
 
gpg --no-default-keyring --keyring ./unity_keyring.gpg --import public
 
gpg --no-default-keyring --keyring ./unity_keyring.gpg --export > ./unity-archive-keyring.gpg
 
sudo mv ./unity-archive-keyring.gpg /etc/apt/trusted.gpg.d/
 
sudo apt update
 
sudo apt-get install unityhub