According to https://stackoverflow.com/questions/66319610/gpg-error-in-ubuntu-21-04-after-second-apt-get-update-during-docker-build, this bug fix is supposed to fix the issue of getting the following error when running "apt-get update" in an Ubuntu 21.04 container: "W: GPG error: http://ports.ubuntu.com/ubuntu-ports hirsute InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed".

I was running into this error when attempting to build my Dockerfiles based on arm64v8/ubuntu:21.04 and arm32v7/ubuntu:21.04. After upgrading my runc version to 1.0.1, the error went away but only for arm64v8/ubuntu:21.04. The Dockerfile based on arm32v7/ubuntu:21.04 still encountered the error. In both cases, I am running the build on an AArch64 device, so it's using emulation for the arm32v7/ubuntu:21.04 scenario. It would appear that it's still broken for that scenario?

The repro is very simple, just run the following command on an AArch64 device: "docker run --rm arm32v7/ubuntu:21.04 apt-get update". It will output the following: 

Unable to find image 'arm32v7/ubuntu:21.04' locally
21.04: Pulling from arm32v7/ubuntu
48989deb32eb: Pulling fs layer
48989deb32eb: Verifying Checksum
48989deb32eb: Download complete
48989deb32eb: Pull complete
Digest: sha256:b61c1421a092dd4ffc0b14a6b683513d775d5daa275598c74cd34090a0424a19
Status: Downloaded newer image for arm32v7/ubuntu:21.04
WARNING: The requested image's platform (linux/arm/v7) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

Get:1 http://ports.ubuntu.com/ubuntu-ports hirsute InRelease [269 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports hirsute-updates InRelease [115 kB]
Err:1 http://ports.ubuntu.com/ubuntu-ports hirsute InRelease
  gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
Get:3 http://ports.ubuntu.com/ubuntu-ports hirsute-backports InRelease [101 kB]
Err:2 http://ports.ubuntu.com/ubuntu-ports hirsute-updates InRelease
  gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
Get:4 http://ports.ubuntu.com/ubuntu-ports hirsute-security InRelease [110 kB]
Err:3 http://ports.ubuntu.com/ubuntu-ports hirsute-backports InRelease
  gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
Err:4 http://ports.ubuntu.com/ubuntu-ports hirsute-security InRelease
  gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
Reading package lists...
W: GPG error: http://ports.ubuntu.com/ubuntu-ports hirsute InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://ports.ubuntu.com/ubuntu-ports hirsute InRelease' is not signed.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports hirsute-updates InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://ports.ubuntu.com/ubuntu-ports hirsute-updates InRelease' is not signed.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports hirsute-backports InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://ports.ubuntu.com/ubuntu-ports hirsute-backports InRelease' is not signed.
W: GPG error: http://ports.ubuntu.com/ubuntu-ports hirsute-security InRelease: gpgv, gpgv2 or gpgv1 required for verification, but neither seems installed
E: The repository 'http://ports.ubuntu.com/ubuntu-ports hirsute-security InRelease' is not signed.


Here's the docker version info for the host machine:

Client:
 Version:           20.10.7
 API version:       1.41
 Go version:        go1.16.4
 Git commit:        f0df35096d5f5e6b559b42c7fde6c65a2909f7c5
 Built:             Sat Sep 11 15:09:09 2021
 OS/Arch:           linux/arm64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.8
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.6
  Git commit:       75249d8
  Built:            Fri Jul 30 19:53:13 2021
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.4.9
  GitCommit:        e25210fe30a0a703442421b0f60afac609f950a3
 runc:
  Version:          1.0.1
  GitCommit:        v1.0.1-0-g4144b63
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0