这是问题 952287：[用户反馈 - 稳定] 由于 GPG 签名密钥过期，Linux 版 Chrome 无法安装/更新的报告
今天，apt在我所有的机器上运行时，谷歌 PPA 都会出现这个错误（对于google-chrome）：
me@mymachine:~$ sudo apt clean && sudo apt update && sudo apt full-upgrade -y && sudo apt autoremove -y && sudo apt autoclean -y && sudo snap refresh
[sudo] password for me:
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu bionic InRelease
Hit:3 http://dl.google.com/linux/chrome/deb stable Release
Hit:4 http://archive.ubuntu.com/ubuntu bionic InRelease
Get:5 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]
Get:6 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB]
Err:7 http://dl.google.com/linux/chrome/deb stable …我正在按照官方指南安装 Docker。
在第 2 步添加 Docker 的官方 GPG 密钥时，出现以下错误：
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
gpg: invalid key resource URL '/tmp/apt-key-gpghome.Rcg4Lpatvi/home:manuelschneid3r.asc.gpg'
gpg: keyblock resource '(null)': General error
gpg: key 1488EB46E192A257: 1 signature not checked due to a missing key
gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys
gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys
gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key
gpg: Total …