步驟：cd /etc/apt //cd到此目錄
ls //檢視此目錄下的檔案
sudo cp source.list source.list.bak //備份原檔案
sudo gedit source.list //gedit開啟原始檔
替換source.list檔案中的全部內容
國內可用**（選一）：
東北大學：
deb-src xenial main restricted #added by software-properties
deb xenial main restricted
deb-src xenial restricted multiverse universe #added by software-properties
deb xenial-updates main restricted
deb-src xenial-updates main restricted multiverse universe #added by software-properties
deb xenial universe
deb xenial-updates universe
deb xenial multiverse
deb xenial-updates multiverse
deb xenial-backports main restricted universe multiverse
deb-src xenial-backports main restricted universe multiverse #added by software-properties
deb xenial partner
deb-src xenial partner
deb xenial-security main restricted
deb-src xenial-security main restricted multiverse universe #added by software-properties
deb xenial-security universe
deb xenial-security multiverse
清華大學：
# deb cdrom:[ubuntu 16.04 lts xenial xerus - release amd64 (20160420.1)]/ xenial main restricted
deb xenial main restricted
deb xenial-updates main restricted
deb xenial universe
deb xenial-updates universe
deb xenial multiverse
deb xenial-updates multiverse
deb xenial-backports main restricted universe multiverse
deb xenial-security main restricted
deb xenial-security universe
deb xenial-security multiverse
阿里雲：
# deb cdrom:[ubuntu 16.04 lts xenial xerus - release amd64 (20160420.1)]/ xenial main restricted
deb-src xenial main restricted #added by software-properties
deb xenial main restricted
deb-src xenial main restricted multiverse universe #added by software-properties
deb xenial-updates main restricted
deb-src xenial-updates main restricted multiverse universe #added by software-properties
deb xenial universe
deb xenial-updates universe
deb xenial multiverse
deb xenial-updates multiverse
deb xenial-backports main restricted universe multiverse
deb-src xenial-backports main restricted universe multiverse #added by software-properties
deb xenial partner
deb-src xenial partner
deb xenial-security main restricted
deb-src xenial-security main restricted multiverse universe #added by software-properties
deb xenial-security universe
deb xenial-security multiverse
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