使用apt-get安装时，会很慢，更换了国内的源后，就可以解决这个问题了。
1. 备份sources.list文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2. 打开sources.list文件
sudo gedit /etc/apt/sources.list
3. 删除原内容，添加下列内容
#清华源
deb /uploads/tupian/20220831/jj1k3n4mcr2 bionic main restricted universe multiversedeb-src /uploads/tupian/20220831/jj1k3n4mcr2 bionic main restricted universe multiversedeb /uploads/tupian/20220831/jj1k3n4mcr2 bionic-updates main restricted universe multiversedeb-src /uploads/tupian/20220831/jj1k3n4mcr2 bionic-updates main restricted universe multiversedeb /uploads/tupian/20220831/jj1k3n4mcr2 bionic-backports main restricted universe multiversedeb-src /uploads/tupian/20220831/jj1k3n4mcr2 bionic-backports main restricted universe multiversedeb /uploads/tupian/20220831/jj1k3n4mcr2 bionic-security main restricted universe multiversedeb-src /uploads/tupian/20220831/jj1k3n4mcr2 bionic-security main restricted universe multiversedeb /uploads/tupian/20220831/jj1k3n4mcr2 bionic-proposed main restricted universe multiversedeb-src /uploads/tupian/20220831/jj1k3n4mcr2 bionic-proposed main restricted universe multiverse
#阿里云源
deb /uploads/tupian/20220831/yviysanldby bionic main restricted universe multiverse
deb /uploads/tupian/20220831/yviysanldby bionic-security main restricted universe multiverse
deb /uploads/tupian/20220831/yviysanldby bionic-updates main restricted universe multiverse
deb /uploads/tupian/20220831/yviysanldby bionic-proposed main restricted universe multiverse
deb /uploads/tupian/20220831/yviysanldby bionic-backports main restricted universe multiverse
deb-src /uploads/tupian/20220831/yviysanldby bionic main restricted universe multiverse
deb-src /uploads/tupian/20220831/yviysanldby bionic-security main restricted universe multiverse
deb-src /uploads/tupian/20220831/yviysanldby bionic-updates main restricted universe multiverse
deb-src /uploads/tupian/20220831/yviysanldby bionic-proposed main restricted universe multiverse
deb-src /uploads/tupian/20220831/yviysanldby bionic-backports main restricted universe multiverse
这两个源都可以用，我都试过，感觉阿里云源速度更快。
4. 更新
保存sources.list文件后需要更新apt-get。
sudo apt-get update
更新完成后就可以正常使用了。
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