戴尔Inspiron从Ubuntu 20.04升级到22.04后，戴尔软件源缺少公钥导致apt更新失败的求助

我最近在戴尔Inspiron上把系统从20.04升级到了22.04。升级后运行apt-get update时出现了以下错误：

Get:1 http://dell.archive.canonical.com jammy InRelease [197 kB]
Err:1 http://dell.archive.canonical.com jammy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D4D1EAED36962F69 NO_PUBKEY F9FDA6BED73CDC22

其他更新源正常运行后，末尾还出现了这些提示：

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dell.archive.canonical.com jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D4D1EAED36962F69 NO_PUBKEY F9FDA6BED73CDC22
W: Failed to fetch http://dell.archive.canonical.com/dists/jammy/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D4D1EAED36962F69 NO_PUBKEY F9FDA6BED73CDC22
W: Some index files failed to download. They have been ignored, or old ones used instead.

我尝试过通过GPG手动添加公钥，参考了戴尔官方文档里的密钥，但遗憾的是没有成功。我想知道：

• 无法从这个源更新会不会影响系统？
• 有没有什么我没考虑到的解决办法？

非常感谢！

备注：内容来源于stack exchange，提问作者Nerdfire