如何修复 apt update EXPKEYSIG 1DB7590E83C8F643
问题：
运行 sudo apt update 时你看到以下错误消息：
apt_expkeysig_surfshark.txt
Err:14 https://ocean.surfshark.com/debian stretch InRelease
The following signatures were invalid: EXPKEYSIG 1DB7590E83C8F643 Surfshark package maintainer <[email protected]>解决方案
通过将以下内容粘贴到你的 shell 中来安装更新的 Surfshark 包（如 Surfshark 帮助页面所示）：
install_surfshark.sh
curl -f https://downloads.surfshark.com/linux/debian-install.sh --output surfshark-install.sh
cat surfshark-install.sh
sh surfshark-install.sh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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