sudo nano /etc/apt/sources.list# 預設注釋了原始碼映象以提高 apt update 速度，如有需要可自行取消注釋
deb bionic main restricted universe multiverse
# deb-src bionic main restricted universe multiverse
deb bionic-updates main restricted universe multiverse
# deb-src bionic-updates main restricted universe multiverse
deb bionic-backports main restricted universe multiverse
# deb-src bionic-backports main restricted universe multiverse
deb bionic-security main restricted universe multiverse
# deb-src bionic-security main restricted universe multiverse
# 預發布軟體源，不建議啟用
# deb bionic-proposed main restricted universe multiverse
# deb-src bionic-proposed main restricted universe multiverse
deb bionic main restricted universe multiverse
deb bionic-security main restricted universe multiverse
deb bionic-updates main restricted universe multiverse
deb bionic-proposed main restricted universe multiverse
deb bionic-backports main restricted universe multiverse
deb-src bionic main restricted universe multiverse
deb-src bionic-security main restricted universe multiverse
deb-src bionic-updates main restricted universe multiverse
deb-src bionic-proposed main restricted universe multiverse
deb-src bionic-backports main restricted universe multiverse
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