# 默認注釋了源碼鏡像以提高 apt update 速度，如有需要可自行取消注釋 deb https://mirrors.tuna./ubuntu/ xenial main restricted universe multiverse # deb-src https://mirrors.tuna./ubuntu/ xenial main restricted universe multiverse deb https://mirrors.tuna./ubuntu/ xenial-updates main restricted universe multiverse # deb-src https://mirrors.tuna./ubuntu/ xenial-updates main restricted universe multiverse deb https://mirrors.tuna./ubuntu/ xenial-backports main restricted universe multiverse # deb-src https://mirrors.tuna./ubuntu/ xenial-backports main restricted universe multiverse deb https://mirrors.tuna./ubuntu/ xenial-security main restricted universe multiverse # deb-src https://mirrors.tuna./ubuntu/ xenial-security main restricted universe multiverse

# 預(yù)發(fā)布軟件源，不建議啟用 # deb https://mirrors.tuna./ubuntu/ xenial-proposed main restricted universe multiverse # deb-src https://mirrors.tuna./ubuntu/ xenial-proposed main restricted universe multiverse