Skype 儲存庫密鑰已過期？

當我 apt-get update 時，微軟 Skype 的儲存庫說：

W: An error occurred during the signature verification. 
The repository is not updated and the previous index files will be used.
GPG error: https://repo.skype.com/deb stable InRelease: The following signatures were invalid:
EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <se-um@microsoft.com>
W: Failed to fetch https://repo.skype.com/deb/dists/stable/InRelease   
The following signatures were invalid: 
EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <se-um@microsoft.com>
W: Some index files failed to download. They have been ignored, or old ones used instead.

為什麼會這樣？我的系統有問題嗎？我該怎麼辦？

看來您需要重新獲取 GPG 密鑰，如下所示：

curl https://repo.skype.com/data/SKYPE-GPG-KEY | sudo apt-key add -

並且警告/錯誤將消失。

請參閱Linux Mint Reddit上對此問題的討論。

引用自：https://unix.stackexchange.com/questions/655961