I believe the error message 

https://github.com/quarto-dev/quarto-cli/blob/9aab5bdb83ae567b4a38c9374a58412dea41a8de/src/core/jupyter/capabilities.ts#L76

is confusing, because an environment variable with the name `QUARTO_JUPYTER` does not exist. I think it should be called `QUARTO_PYTHON` because that is the name of the variable that is checked in the code at 

https://github.com/quarto-dev/quarto-cli/blob/9aab5bdb83ae567b4a38c9374a58412dea41a8de/src/core/jupyter/capabilities.ts#L56
2022-07-27T16:18:36Z
asmaier
v1.1
closed
Env variable QUARTO_JUPYTER does not exist
https://github.com/quarto-dev/quarto-cli/issues/1551