我正在尝试更新我的 Ubuntu 18，同时遇到与 Teamviewer 相关的错误，该版本不受支持。即使从已安装的软件中删除 Teamviewer 也无法解决问题，更新后仍然出现此错误：
Err:7 https://linux.teamviewer.com/deb stable InRelease
403 Forbidden [IP: 54.192.105.21 443]
Reading package lists... Done
E: Failed to fetch https://linux.teamviewer.com/deb/dists/stable/InRelease 403 Forbidden [IP: 54.192.105.21 443]
E: The repository 'https://linux.teamviewer.com/deb stable InRelease' is no longer signed.
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.
请帮助解决该错误。谢谢你，