Ubuntu 22.04执行sudo apt update时遇ROS仓库404错误及AnyDesk密钥警告的解决求助

大家好，我把Ubuntu系统安装在外部硬盘上，当前系统版本信息如下：

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:    22.04
Codename:   jammy

最近执行sudo apt update命令时遇到了报错，完整输出如下：

sudo apt update
Hit:1 http://security.ubuntu.com/ubuntu jammy-security InRelease
Hit:2 http://de.archive.ubuntu.com/ubuntu jammy InRelease
Hit:3 http://deb.anydesk.com all InRelease
Ign:4 http://packages.ros.org/ros/ubuntu jammy InRelease
Err:5 http://packages.ros.org/ros/ubuntu jammy Release
404  Not Found [IP: 64.50.233.100 80]
Reading package lists... Done
E: The repository 'http://packages.ros.org/ros/ubuntu jammy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: http://deb.anydesk.com/dists/all/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

换成sudo apt-get update执行，还是遇到完全相同的错误：

sudo apt-get update
Hit:1 http://deb.anydesk.com all InRelease
Hit:2 http://de.archive.ubuntu.com/ubuntu jammy InRelease
Hit:3 http://security.ubuntu.com/ubuntu jammy-security InRelease
Ign:4 http://packages.ros.org/ros/ubuntu jammy InRelease
Err:5 http://packages.ros.org/ros/ubuntu jammy Release
404  Not Found [IP: 140.211.166.134 80]
Reading package lists... Done
W: http://deb.anydesk.com/dists/all/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
E: The repository 'http://packages.ros.org/ros/ubuntu jammy Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

我已经尝试过搜索相关问题，参考了「What can I do if a repository/PPA does not have a Release file?」的回答，执行了以下命令：

sudo add-apt-repository --remove ppa:mc3man/trusty-media
sudo apt-get update

但执行后还是出现同样的ROS仓库404错误。我现在有点疑惑，会不会是我使用的http://de.archive.ubuntu.com这个源导致的问题？希望大家能帮忙看看怎么解决这两个问题，谢谢！

备注：内容来源于stack exchange，提问作者FabioSpaghetti