Ensure the right version of libstdc++(11) is installed #6788
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Follow up to #6772, which had optimistically assumed that the Ubuntu 20.04 default (-9) was satisfactory. That is not in fact the case, it is missing
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for example. -11 is installed in CI/ccf-dev contests through piccolo->parquet, which was hiding this problem until an application tried to use a -dev container.