对于 Debian 7.0，请运行以下命令：
Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).
echo 'deb http://download.opensuse.org/repositories/shells:/fish:/beta:/2/Debian_7.0/ /' | sudo tee /etc/apt/sources.list.d/shells:fish:beta:2.list
curl -fsSL https://download.opensuse.org/repositories/shells:fish:beta:2/Debian_7.0/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/shells_fish_beta_2.gpg > /dev/null
sudo apt update
sudo apt install fish