Official package repository for Cortex Linux.
# Download and add GPG key
curl -fsSL https://apt.cortexlinux.com/cortex-archive-keyring.gpg | sudo gpg --dearmor -o /usr/share/keyrings/cortex-archive-keyring.gpg
# Add repository to sources
echo "deb [signed-by=/usr/share/keyrings/cortex-archive-keyring.gpg] http://apt.cortexlinux.com stable main" | sudo tee /etc/apt/sources.list.d/cortex.list
# Update and install
sudo apt update
sudo apt install cortex-cli