[Bug 1890332] [NEW] apt update fails on docker arm container 20.04

[Anthony C]

Public bug reported:

Running `apt update` in a ubuntu:20.04 docker container on raspberry pi
fails with GPG errors.

Expected behaviour:

Successfully update the system through `apt update`

What happens instead:

`Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
  At least one invalid signature was encountered.`

Complete log:
https://pastebin.com/sggGJcY1

How to reproduce:
On a Raspberry Pi 3b or 4b (and maybe others ?), run the following command:
`docker run ubuntu:latest apt update`
or more specifically:
`docker run arm32v7/ubuntu:20.04 apt update`

More information:
I can reproduce the bug on the following host systems:
* Raspberry Pi 3b running HypriotOS
* Raspberry Pi 4b running Raspbian GNU/Linux 10 (buster)

The problem does not happens on the following host system:
* Raspberry Pi 3b running Arch Linux Arm

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

- Running `apt update` in a ubuntu:20.04 docker container fails with GPG
- errors.
+ Running `apt update` in a ubuntu:20.04 docker container on raspberry pi
+ fails with GPG errors.
  
  Expected behaviour:
  
  Successfully update the system through `apt update`
  
  What happens instead:
  
  `Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
-   At least one invalid signature was encountered.`
+   At least one invalid signature was encountered.`
  
  Complete log:
  https://pastebin.com/sggGJcY1
  
  How to reproduce:
  On a Raspberry Pi 3b or 4b (and maybe others ?), run the following command:
  `docker run ubuntu:latest apt update`
  or more specifically:
  `docker run arm32v7/ubuntu:20.04 apt update`
  
  More information:
  I can reproduce the bug on the following host systems:
  * Raspberry Pi 3b running HypriotOS
  * Raspberry Pi 4b running Raspbian GNU/Linux 10 (buster)
  
  The problem does not happens on the following host system:
  * Raspberry Pi 3b running Arch Linux Arm

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https://bugs.launchpad.net/bugs/1890332

Title:
  apt update fails on docker arm container 20.04

Status in apt package in Ubuntu:
  New

Bug description:
  Running `apt update` in a ubuntu:20.04 docker container on raspberry
  pi fails with GPG errors.

  Expected behaviour:

  Successfully update the system through `apt update`

  What happens instead:

  `Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
    At least one invalid signature was encountered.`

  Complete log:
  https://pastebin.com/sggGJcY1

  How to reproduce:
  On a Raspberry Pi 3b or 4b (and maybe others ?), run the following command:
  `docker run ubuntu:latest apt update`
  or more specifically:
  `docker run arm32v7/ubuntu:20.04 apt update`

  More information:
  I can reproduce the bug on the following host systems:
  * Raspberry Pi 3b running HypriotOS
  * Raspberry Pi 4b running Raspbian GNU/Linux 10 (buster)

  The problem does not happens on the following host system:
  * Raspberry Pi 3b running Arch Linux Arm

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