Ubuntu image seems to have an issue with apt keys

[nain-F49FF806]

When doing distrobox-enter

+ apt-get update
Get:1 http://archive.ubuntu.com/ubuntu mantic InRelease [256 kB]
Get:2 http://security.ubuntu.com/ubuntu mantic-security InRelease [109 kB]
Err:2 http://security.ubuntu.com/ubuntu mantic-security InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
Err:1 http://archive.ubuntu.com/ubuntu mantic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
Get:3 http://archive.ubuntu.com/ubuntu mantic-updates InRelease [109 kB]
Err:3 http://archive.ubuntu.com/ubuntu mantic-updates InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
Get:4 http://archive.ubuntu.com/ubuntu mantic-backports InRelease [90.8 kB]
Err:4 http://archive.ubuntu.com/ubuntu mantic-backports InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
Reading package lists...
W: GPG error: http://security.ubuntu.com/ubuntu mantic-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
E: The repository 'http://security.ubuntu.com/ubuntu mantic-security InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu mantic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
E: The repository 'http://archive.ubuntu.com/ubuntu mantic InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu mantic-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
E: The repository 'http://archive.ubuntu.com/ubuntu mantic-updates InRelease' is not signed.
W: GPG error: http://archive.ubuntu.com/ubuntu mantic-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
E: The repository 'http://archive.ubuntu.com/ubuntu mantic-backports InRelease' is not signed.
Error: An error occurred

[nain-F49FF806]

The problem seems to have been with apt failing in the podman container environment.
Similar happens for fedora/dnf too.

Probably something to do with how networking plumbing works for containers.
The package managers don't like it.

using config to deal with "bad proxy" helps deal with this issue.
#12 fixes this