hyperion@hyperion:~/firefox$ $PATH | grep rust
bash: /home/hyperion/.nvm/versions/node/v10.11.0/bin:/home/hyperion/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin: No such file or directory

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hyperion@hyperion:~/firefox$ curl https://sh.rustup.rs -sSf | sh
info: downloading installer
error: it looks like you have an existing installation of Rust at:
error: /usr/bin
error: rustup cannot be installed alongside Rust. Please uninstall first
error: if this is what you want, restart the installation with `-y'
error: cannot install while Rust is installed
hyperion@hyperion:~/firefox$