Ubuntu 20.04換阿里源

1 備份原來的源
cp -ra /etc/apt/sources.list /etc/apt/sources.list.bak

2 搞清楚ubuntu的代號，比如：

4.10 Warty Warthog(長疣的疣豬)
5.04 Hoary Hedgehog(灰白的刺蝟)
5.10 Breezy Badger(活潑的獾)

6.06(LTS) Dapper Drake(整潔的公鴨)
6.10 Edgy Eft(急躁的水蜥)
7.04 Feisty Fawn(壞脾氣的小鹿)
7.10 Gutsy Gibbon(勇敢的長臂猿)

8.04(LTS) Hardy Heron(耐寒的蒼鷺)
8.10 Intrepid Ibex (勇敢的野山羊)
9.04 Jaunty Jackalope(得意洋洋的懷俄明野兔)
9.10 Karmic Koala(幸運的考拉)

10.04(LTS) Lucid Lynx(清醒的猞猁)
10.10 Oneiric Ocelot(夢幻的豹貓)
11.04 Natty Narwhal(敏捷的獨角鯨)
11.10 Oneiric Ocelot（有夢的虎貓）

12.04(LTS) Precise Pangolin(精准的穿山甲)
12.10 Quantal Quetzal(量子的綠咬鵑)
13.04 Raring Ringtail(鉚足了勁的貓熊)
13.10 Saucy Salamander(活潑的蠑螈)

14.04(LTS) Trusty Tahr (可靠的塔爾羊)(LTS)
14.10 Utopic Unicorn(烏托邦獨角獸)
15.04 Vivid Vervet (活潑的小猴)
15.10 Wily Werewolf (狡猾的狼人)

16.04(LTS) Xenial Xerus (好客的非洲地松鼠)
16.10 Yakkety Yak（氂牛）
17.04 Zesty Zapus(開心的跳鼠)
17.10 Artful Aardvark(機靈的土豚)

18.04(LTS) Bionic Beaver（仿生海狸）
18.10 Cosmic Cuttlefish（宇宙墨魚）
19.04 Disco Dingo（舞動的靈犬）
19.10 Eoan Ermine（白貂）

20.04(LTS) Focal Fossa（專注的馬達加斯加長尾狸貓）
…
要知道當前系統的代號，可以用以下命令：

lsb_release -a

    1

在這里插入圖片描述
3 到阿里源看下這個源存在不存在

http://archive.ubuntu.com/ubuntu/dists/
在這里插入圖片描述
可以看到，現在已經有了ubuntu 20.04(代號focal)的源。
4 然后以下面的為模板，把’TODO’的地方換成上面的Codename

deb http://mirrors.aliyun.com/ubuntu/ TODO main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ TODO main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ TODO-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ TODO-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ TODO-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ TODO-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ TODO-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ TODO-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ TODO-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ TODO-backports main restricted universe multiverse

比如我換好20.04的源以后是這樣：

deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

然后粘貼到剛才的/etc/apt/sources.list里。
5 更新緩存和升級

sudo apt-get update
sudo apt-get upgrade