Ubuntu install help

Hi there! I am brand new to unbuntu and I have just build a
computer running it. I am currently trying to download TensorFlow
for my computer and I am trying to run the comamnd:

$. ./venv/bin/activate.fish # fish

and it’s returning this:

bash: ./venv/bin/activate.fish: line 4: syntax error near
unexpected token `-d’

bash: ./venv/bin/activate.fish: line 4: `function deactivate -d
“Exit virtualenv and return to normal shell environment”‘

Any thoughts?