Debian Stretch升级：卸载docker云，仍在apt列表中

几个月前我曾尝试安装docker cloud，但已将其删除。现在我已经从Jessie更新到Debian Stretch，当我通过apt get update进行更新时，我发现了这个错误，不知道如何解决它。有人能帮忙吗？谢谢

sudo apt-get update
Get:1 http://debian.mirrors.ovh.net/debian stretch-updates InRelease
Ign:2 http://debian.mirrors.ovh.net/debian stretch InRelease
Get:3 http://repo.cloud.docker.com/ubuntu dockercloud InRelease [1,383 B]
Get:4 http://debian.mirrors.ovh.net/debian stretch Release
Hit:5 https://deb.nodesource.com/node_6.x jessie InRelease
Hit:6 https://apt.dockerproject.org/repo debian-stretch InRelease
Hit:7 http://security.debian.org stretch/updates InRelease
Ign:8 http://download.draios.com/stable/deb stable-amd64/ InRelease
Hit:9 http://download.draios.com/stable/deb stable-amd64/ Release
Ign:3 http://repo.cloud.docker.com/ubuntu dockercloud InRelease
Fetched 203 kB in 0s (247 kB/s)
Reading package lists... Done
W: GPG error: http://repo.cloud.docker.com/ubuntu dockercloud InRelease: The following signatures were invalid: 278FE7333CFF7F8B60B677E85DD27147EF170D1C
W: The repository 'http://repo.cloud.docker.com/ubuntu dockercloud InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

实际上，这是一个警告，而不是一个错误。 似乎在你的资料来源的某个地方/etc/apt/sources.list您仍然有docker回购

$ sudo grep -w "docker.com" /etc/apt/*.*

将显示docker的url的位置。如果您不再需要它，只需注释这一行即可

好吧，如果你还需要docker，这可能会有帮助

$ sudo grep -w "docker.com" /etc/apt/*.*