使用apt-get安裝時，會很慢，更換了國內的源後，就可以解決這個問題了。
1. 備份sources.list檔案
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2. 開啟sources.list檔案
sudo gedit /etc/apt/sources.list
3. 刪除原內容，新增下列內容
#清華源
deb bionic main restricted universe multiversedeb-src bionic main restricted universe multiversedeb bionic-updates main restricted universe multiversedeb-src bionic-updates main restricted universe multiversedeb bionic-backports main restricted universe multiversedeb-src bionic-backports main restricted universe multiversedeb bionic-sec程式設計客棧urity main restricted universe multiversedeb-src bionic-security main restricted universe multiversedeb bionic-proposed main restricted universe multiversedeb-src bionic-proposed main restricted universe multiverse
#阿里雲源
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 bi程式設計客棧on程式設計客棧ic-security main restricted universe multiverse
deb-src bionic-updates main restricted universe multiverse
deb-src h程式設計客棧ttp: bionic-proposed main restricted universe multiverse
deb-src bionic-backports main restricted universe multivevyohqeddrse
這兩個源都可以用，我都試過，感覺阿里雲源速度更快。
4. 更新
儲存sources.list檔案後需要更新apt-get。
sudo apt-get update
更新完成後就可以正常使用了。
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