清華大學開源映象站：
ubuntu 的軟體源配置檔案是
/etc/apt/sources.list
。將系統自帶的該檔案做個備份，將該檔案替換為下面內容，即可使用 tuna 的軟體源映象。
備份：sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
修改配置（見sources.list內容）：
sudo gedit /etc/apt/sources.list
更新源sudo apt-get update
執行結果如下：
# 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
16.04lts sources.list內容
# 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 xenial main restricted universe multiverse
# deb-src xenial main restricted universe multiverse
deb xenial-updates main restricted universe multiverse
# deb-src xenial-updates main restricted universe multiverse
deb xenial-backports main restricted universe multiverse
# deb-src xenial-backports main restricted universe multiverse
deb xenial-security main restricted universe multiverse
# deb-src xenial-security main restricted universe multiverse
# 預發布軟體源，不建議啟用
# deb xenial-proposed main restricted universe multiverse
# deb-src xenial-proposed main restricted universe multiverse
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