This issue, graphviz.backend.ExecutableNotFound: failed to execute 'dot', make sure the Graphviz executables are on your systems' PATH is occuring through my venv. It would seem to me that the executable would come prepackaged with prefect['viz'] or prefect['dev']. I'm using debian/bash. Anyone else come across this issue?

@Royzac can you try: apt-get install graphviz? I know that I had to install it first before prefect viz

@Anna Geller (old account) Some improvement here after system installation, the bug is resolved and now I get this issue. Did you get this problem?

@Royzac by default, GraphViz opens the Flow view in a PDF viewer. Can you install one for your OS and try again?

Awesome, thanks Anna!