如何使用debootstrap构建一个最小化的Ubuntu

进入Shell并安装debootstrap

$ sudo apt update && apt install debootstrap
    Ign:1 cdrom://Ubuntu-Server 20.04 LTS _Focal Fossa_ - Release amd64 (20200423) focal InRelease
    Hit:2 cdrom://Ubuntu-Server 20.04 LTS _Focal Fossa_ - Release amd64 (20200423) focal Release
    Get:4 http://mirrors.aliyun.com/ubuntu focal InRelease [265 kB]
    Get:5 http://mirrors.aliyun.com/ubuntu focal-updates InRelease [107 kB]
    Get:6 http://mirrors.aliyun.com/ubuntu focal-backports InRelease [98.3 kB]
    Get:7 http://mirrors.aliyun.com/ubuntu focal-security InRelease [107 kB]
    Get:8 http://mirrors.aliyun.com/ubuntu focal/main amd64 Packages [970 kB]
    Get:9 http://mirrors.aliyun.com/ubuntu focal/main Translation-en [506 kB]
    Get:10 http://mirrors.aliyun.com/ubuntu focal/main amd64 c-n-f Metadata [29.5 kB]
    Get:11 http://mirrors.aliyun.com/ubuntu focal/restricted amd64 Packages [22.0 kB]
    Get:12 http://mirrors.aliyun.com/ubuntu focal/restricted Translation-en [6212 B]
    Get:13 http://mirrors.aliyun.com/ubuntu focal/restricted amd64 c-n-f Metadata [392 B]
    Get:14 http://mirrors.aliyun.com/ubuntu focal/universe amd64 Packages [8628 kB]
    Get:15 http://mirrors.aliyun.com/ubuntu focal/universe Translation-en [5124 kB]
    Get:16 http://mirrors.aliyun.com/ubuntu focal/universe amd64 c-n-f Metadata [265 kB]
    Get:17 http://mirrors.aliyun.com/ubuntu focal/multiverse amd64 Packages [144 kB]
    Get:18 http://mirrors.aliyun.com/ubuntu focal/multiverse Translation-en [104 kB]
    Get:19 http://mirrors.aliyun.com/ubuntu focal/multiverse amd64 c-n-f Metadata [9136 B]
    Get:20 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 Packages [197 kB]
    Get:21 http://mirrors.aliyun.com/ubuntu focal-updates/main Translation-en [77.7 kB]
    Get:22 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 c-n-f Metadata [5676 B]
    Get:23 http://mirrors.aliyun.com/ubuntu focal-updates/restricted amd64 Packages [11.0 kB]
    Get:24 http://mirrors.aliyun.com/ubuntu focal-updates/restricted Translation-en [3000 B]
    Get:25 http://mirrors.aliyun.com/ubuntu focal-updates/restricted amd64 c-n-f Metadata [116 B]
    Get:26 http://mirrors.aliyun.com/ubuntu focal-updates/universe amd64 Packages [110 kB]
    Get:27 http://mirrors.aliyun.com/ubuntu focal-updates/universe Translation-en [51.9 kB]
    Get:28 http://mirrors.aliyun.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [4092 B]
    Get:29 http://mirrors.aliyun.com/ubuntu focal-updates/multiverse amd64 Packages [1172 B]
    Get:30 http://mirrors.aliyun.com/ubuntu focal-updates/multiverse Translation-en [540 B]
    Get:31 http://mirrors.aliyun.com/ubuntu focal-updates/multiverse amd64 c-n-f Metadata [116 B]
    Get:32 http://mirrors.aliyun.com/ubuntu focal-backports/main amd64 c-n-f Metadata [112 B]
    Get:33 http://mirrors.aliyun.com/ubuntu focal-backports/restricted amd64 c-n-f Metadata [116 B]
    Get:34 http://mirrors.aliyun.com/ubuntu focal-backports/universe amd64 Packages [2784 B]
    Get:35 http://mirrors.aliyun.com/ubuntu focal-backports/universe Translation-en [1272 B]
    Get:36 http://mirrors.aliyun.com/ubuntu focal-backports/universe amd64 c-n-f Metadata [192 B]
    Get:37 http://mirrors.aliyun.com/ubuntu focal-backports/multiverse amd64 c-n-f Metadata [116 B]
    Get:38 http://mirrors.aliyun.com/ubuntu focal-security/main amd64 Packages [106 kB]
    Get:46 http://mirrors.aliyun.com/ubuntu focal-security/universe amd64 c-n-f Metadata [1612 B]
    Get:47 http://mirrors.aliyun.com/ubuntu focal-security/multiverse amd64 Packages [1172 B]
    Get:48 http://mirrors.aliyun.com/ubuntu focal-security/multiverse Translation-en [540 B]
    Get:49 http://mirrors.aliyun.com/ubuntu focal-security/multiverse amd64 c-n-f Metadata [116 B]
    Fetched 17.1 MB in 6s (3096 kB/s)
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    65 packages can be upgraded. Run 'apt list --upgradable' to see them.
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    Suggested packages:
      arch-test squid-deb-proxy-client
    The following NEW packages will be installed:
      debootstrap
    0 upgraded, 1 newly installed, 0 to remove and 65 not upgraded.
    Need to get 39.4 kB of archives.
    After this operation, 299 kB of additional disk space will be used.
    Get:1 http://mirrors.aliyun.com/ubuntu focal-updates/main amd64 debootstrap all 1.0.118ubuntu1.1 [39.4 kB]
    Fetched 39.4 kB in 0s (221 kB/s)
    Selecting previously unselected package debootstrap.
    (Reading database ... 33860 files and directories currently installed.)
    Preparing to unpack .../debootstrap_1.0.118ubuntu1.1_all.deb ...
    Unpacking debootstrap (1.0.118ubuntu1.1) ...
    Setting up debootstrap (1.0.118ubuntu1.1) ...
    Processing triggers for man-db (2.9.1-1) ...
$ debootstrap
    I: usage: [OPTION]... <suite> <target> [<mirror> [<script>]]
    I: Try `debootstrap --help' for more information.
    E: You must specify a suite and a target.