我的虚拟机是18.04。我想更新到php8.1
我的机器上已经有 PPA php 存储库：
sudo add-apt-repository ppa:ondrej/php
我可以看到有一个文件：
# ls -l /var/lib/apt/lists/ppa.launchpad.net_on*
-rw-r--r-- 1 root root 20811 Jun 15 21:41 /var/lib/apt/lists/ppa.launchpad.net_ondrej_php_ubuntu_dists_bionic_InRelease
我努力了：
root@prod:~# apt clean
root@prod:~# apt update
Hit:1 http://mirror.binarylane.com.au/ubuntu bionic InRelease
Hit:2 http://mirror.binarylane.com.au/ubuntu bionic-updates InRelease
Hit:3 http://mirror.binarylane.com.au/ubuntu bionic-backports InRelease
Hit:4 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease
Get:5 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit:6 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:7 http://ppa.launchpad.net/maxmind/ppa/ubuntu bionic InRelease
Hit:8 http://ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease
Fetched 88.7 kB in 2s (46.0 kB/s)
Reading package lists... Done
Building dependency tree
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