---
title: apt换源
createTime: 2023/01/10 14:54:26
tags:
    - Ubuntu
categories:
    - 随记
---

1. 查看 codename

```bash
lsb_release -a
```

```text
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.5 LTS
Release:        20.04
Codename:       focal
```

2. 换源

```bash
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo vi /etc/apt/sources.list
```

**注意这里 codename 的对应关系**

```sources.list
deb https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ focal-proposed main restricted universe multiverse
```

```bash
# 如果报错 NO_PUBKEY ABCDE12345
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com ABCDE12345
```

3. 更新

```bash
sudo apt update
sudo apt upgrade
```

> ubuntu 安装时的 mirror 选择：`https://mirrors.ustc.edu.cn/ubuntu`