首先

Ubuntu20.04上默认安装了Nginx。
母文：Nginx的各种安装方法和EOL概述。

日志

安装

# cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

# apt update; apt install -y nginx
... 略

各种确认 –

# which nginx
/usr/sbin/nginx

# nginx -v
nginx version: nginx/1.17.10 (Ubuntu)

# apt show nginx
Package: nginx
Version: 1.17.10-0ubuntu1
Priority: optional
Section: web
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Nginx Maintainers <pkg-nginx-maintainers@lists.alioth.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 45.1 kB
Depends: nginx-core (<< 1.17.10-0ubuntu1.1~) | nginx-full (<< 1.17.10-0ubuntu1.1~) | nginx-light (<< 1.17.10-0ubuntu1.1~) | nginx-extras (<< 1.17.10-0ubuntu1.1~), nginx-core (>= 1.17.10-0ubuntu1) | nginx-full (>= 1.17.10-0ubuntu1) | nginx-light (>= 1.17.10-0ubuntu1) | nginx-extras (>= 1.17.10-0ubuntu1)
Homepage: http://nginx.net
Download-Size: 3616 B
APT-Manual-Installed: yes
APT-Sources: http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
Description: small, powerful, scalable web/proxy server

在 changelogs.ubuntu.com/changelogs/pool/main/n/nginx/nginx_1.18.0-0ubuntu1/changelog 中，似乎已经更新到了1.18版本。

# which nginx
/usr/sbin/nginx

# nginx -v
nginx version: nginx/1.18.0 (Ubuntu)

# apt show nginx
Package: nginx
Version: 1.18.0-0ubuntu1
Priority: optional
Section: web
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Nginx Maintainers <pkg-nginx-maintainers@lists.alioth.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 45.1 kB
Depends: nginx-core (<< 1.18.0-0ubuntu1.1~) | nginx-full (<< 1.18.0-0ubuntu1.1~) | nginx-light (<< 1.18.0-0ubuntu1.1~) | nginx-extras (<< 1.18.0-0ubuntu1.1~), nginx-core (>= 1.18.0-0ubuntu1) | nginx-full (>= 1.18.0-0ubuntu1) | nginx-light (>= 1.18.0-0ubuntu1) | nginx-extras (>= 1.18.0-0ubuntu1)
Homepage: http://nginx.net
Phased-Update-Percentage: 90
Download-Size: 3624 B
APT-Manual-Installed: yes
APT-Sources: http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
Description: small, powerful, scalable web/proxy server

N: There is 1 additional record. Please use the '-a' switch to see it

# apt show nginx -a
Package: nginx
Version: 1.18.0-0ubuntu1
Priority: optional
Section: web
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Nginx Maintainers <pkg-nginx-maintainers@lists.alioth.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 45.1 kB
Depends: nginx-core (<< 1.18.0-0ubuntu1.1~) | nginx-full (<< 1.18.0-0ubuntu1.1~) | nginx-light (<< 1.18.0-0ubuntu1.1~) | nginx-extras (<< 1.18.0-0ubuntu1.1~), nginx-core (>= 1.18.0-0ubuntu1) | nginx-full (>= 1.18.0-0ubuntu1) | nginx-light (>= 1.18.0-0ubuntu1) | nginx-extras (>= 1.18.0-0ubuntu1)
Homepage: http://nginx.net
Phased-Update-Percentage: 90
Download-Size: 3624 B
APT-Manual-Installed: yes
APT-Sources: http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
Description: small, powerful, scalable web/proxy server

Package: nginx
Version: 1.17.10-0ubuntu1
Priority: optional
Section: web
Origin: Ubuntu
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Debian Nginx Maintainers <pkg-nginx-maintainers@lists.alioth.debian.org>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 45.1 kB
Depends: nginx-core (<< 1.17.10-0ubuntu1.1~) | nginx-full (<< 1.17.10-0ubuntu1.1~) | nginx-light (<< 1.17.10-0ubuntu1.1~) | nginx-extras (<< 1.17.10-0ubuntu1.1~), nginx-core (>= 1.17.10-0ubuntu1) | nginx-full (>= 1.17.10-0ubuntu1) | nginx-light (>= 1.17.10-0ubuntu1) | nginx-extras (>= 1.17.10-0ubuntu1)
Homepage: http://nginx.net
Download-Size: 3616 B
APT-Sources: http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
Description: small, powerful, scalable web/proxy server