如何修复 apt update EXPKEYSIG 1F3045A5DF7587C3
问题：
运行 sudo apt update 时你看到以下错误消息：
apt_expkeysig.txt
Err:14 https://repo.skype.com/deb stable InRelease
The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <se-um@microsoft.com>解决方案
使用以下命令删除并重新添加 skype 密钥
fix_skype_key.sh
sudo apt-key del 1F3045A5DF7587C3
curl https://repo.skype.com/data/SKYPE-GPG-KEY | sudo apt-key add -之后，错误应该已修复，你可以运行
apt_update.sh
sudo apt update再次。
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