在之前使用 DigitalOcean 的 VPS 的时候，有遇到这个问题。

davidyin@fig:~$ sudo apt update
[sudo] password for davidyin:
Hit:1 https://repos.insights.digitalocean.com/apt/do-agent main InRelease
Hit:2 https://repos-droplet.digitalocean.com/apt/droplet-agent main InRelease
Get:3 http://mirrors.digitalocean.com/ubuntu jammy InRelease [270 kB]
Get:4 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
Ign:5 https://download.webmin.com/download/repository sarge InRelease
Hit:6 https://download.webmin.com/download/repository sarge Release
Hit:8 http://mirrors.digitalocean.com/ubuntu jammy-updates InRelease
Hit:9 http://mirrors.digitalocean.com/ubuntu jammy-backports InRelease
Fetched 380 kB in 7s (51.8 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
W: https://repos.insights.digitalocean.com/apt/do-agent/dists/main/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

SSH 登录到服务器后，查看目录 /etc/apt/sources.list.d/ 里面的文件。

davidyin@fig:/etc/apt/sources.list.d$ ls -lah
total 20K
drwxr-xr-x 2 root root 4.0K May 14 16:09 .
drwxr-xr-x 8 root root 4.0K May 14 14:52 ..
-rw-r--r-- 1 root root   67 May 14 14:52 digitalocean-agent.list
-rw-r--r-- 1 root root  129 May 14 14:52 droplet-agent.list
-rw-r--r-- 1 root root  116 May 14 16:09 webmin.list
davidyin@fig:/etc/apt/sources.list.d$

有三个， Webmin.list 是我自己安装的，而 digitalocean 的 agent 有两个，觉得一定有什么误会在里面。看看里面的内容。

droplet-agent.list
deb [signed-by=/usr/share/keyrings/droplet-agent-keyring.gpg] https://repos-droplet.digitalocean.com/apt/droplet-agent main main

digitalocean-agent.list
deb https://repos.insights.digitalocean.com/apt/do-agent main main

删掉这个就好了。

sudo rm digitalocean-agent.list

再做系统更新的时候就没有上述这个错误了。