Possible error to recommend a fix for

```
ERROR: Could not find an activated virtualenv (required).
```

The error might relate to https://stackoverflow.com/questions/16460313/pip-could-not-find-an-activated-virtualenv-required

Where the fix is to change a line in your `.bashrc` (or perhaps `config.fish` or other control files for terminal/bash?)

```
export PIP_REQUIRE_VIRTUALENV=true
```

to

```
export PIP_REQUIRE_VIRTUALENV=false
```

As a first pass we should implement an error checker to scan the logfile / stash for this error and signal in installation that it might not have worked.