What is a common location for both bacterial ribosomes and eukaryotic ribosomes?

Perhaps the common location would be within the cytoplasm.

Explanation:

This is because eukaryotic organisms have their organisms bound within their cell membranes, one such organelle would be their ribosomes. The same is true for bacterial cells in which their organelles are bound within their cell membranes as well, one such organelle would also be their ribosomes. Hence, the similarity, which in this case is their ribosomes, both reside within the cytoplasms.  

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