V12 bench update fails while backing up sites

[clarkej]

@chrismberi

Thought I was running python 3 but error suggest I may be running 2.7

This may fix that if you have not tried it

/bin/sh: 1: snyk: not found when bench update

This shows that the problem is python uses python2.7 when what you want to invoke is python3, hence to use alias python=python3 as this advises python3 - How to make 'python' program command execute Python 3? - Ask Ubuntu