1. 先將預設的軟體源備份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2. 更換軟體源
sudo gedit /etc/apt/sources.list
將以下內容覆蓋原來的
# 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 focal main restricted universe multiverse
# deb-src focal main restricted universe multiverse
deb focal-updates main restricted universe multiverse
# deb-src focal-updates main restricted universe multiverse
deb focal-backports main restricted universe multiverse
# deb-src focal-backports main restricted universe multiverse
deb focal-security main restricted universe multiverse
# deb-src focal-security main restricted universe multiverse
# 預發布軟體源，不建議啟用
# deb focal-proposed main restricted universe multiverse
# deb-src focal-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
sudo apt-get update //更新源
sudo apt-get upgrade //更新軟體
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