Quoting Helmut Grohne (2023-02-05 21:23:18)
>  * It must be possible to mount proc in the unshared user+mount+pid
>    namespace.
>    - This should always work but may be restricted by the container
>      technology for some reason.
>    - Test case: unshare -U -m -p -f -r --mount-proc true
>    - Paul tried this in the operational lxc containers. Successfully.
>    - I tried this in a local autopkgtest-unstable lxc container.
>      Successfully (unprivileged).
>    - Johannes reported that this would be the step that fails.

as a datapoint, on salsaci this happens:

+ runuser -u debci -- unshare -U -m -p -f -r --mount-proc true
unshare: mount /proc failed: Operation not permitted

Next I'm trying just to bind-mount /proc... lets see...

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