reticulate fails to discover virtualenv on Debian/Ubuntu if `python-venv` not installed
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On Ubuntu/Debian, users typically have to run sudo apt install python3-venv before virtualenv_create() succeeds. The error message that is presented in this situation is helpful.
On systems where venv is not installed, reticulate will try and discover virtualenv as a fallback.
Ubuntu/Debian apt install python installs python with a "fake" venv module, which reticulate discovers and uses in preference over virtualenv. Specifically, reticulate discovers it here, based on this check, which just checks python -c 'import venv' for non-zero exit status.
Reticulate needs a more robust check there for seeing if the venv is usable. And if not, then reticulate should continue the search and discover virtualenv.
Related: mlverse/pysparklyr#11