我正在尝试从 ubuntu16 升级到 ubuntu20，为此我需要将映像更改arm32v7/ubuntu:16.04为arm32v7/ubuntu:20.04我们所有的 Dockerfile [之后更新所需的库]，但是在执行此任务时，我发现 ubuntu:20.04 的 arm32v7 基本映像存在一些问题- 当我运行apt-get update它失败并显示以下错误消息时 -
Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
At least one invalid signature was encountered.
Get:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease [107 kB]
Err:2 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease
At least one invalid signature was encountered.
Err:3 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease
At least one invalid signature was encountered.
Err:4 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease
At least one invalid signature was encountered.
Reading package lists... Done
W: GPG error: http://ports.ubuntu.com/ubuntu-ports focal InRelease: At …