Don't worry! It's only stuff...

Install
wget https://releases.hashicorp.com/vault/0.11.5/vault_0.11.5_linux_amd64.zip -P /tmp/
apt install -y unzip
unzip -d /usr/sbin /tmp/vault_0.11.5_linux_amd64.zip
vault -autocomplete-install

Linux
https://learn.hashicorp.com/vault/