# SAGE 8.1, cannot import python modules from notebook

I'm running into trouble trying to setup SAGE 8.1. What happened is the following. I'm working in Linux Ubuntu 16.4. I installed SAGE 7.5.1 from command-line. Then I installed SAGE 8.1 from pre-built binaries. I deleted the old sage version and now when I run the command sage, it tries to find SAGE 7.5.1 and fails. I already ran:

```
ln -s /SageMath8.1/sage /usr/local/bin/sage
```

And nothing changed. Even though I can run SAGE 8.1 with:

```
/SageMath8.1/.sage
```

But once there I cannot import python modules:

```
>>> import pandas as pd
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-17-af55e7023913> in <module>()
----> 1 import pandas as pd
ImportError: No module named pandas
```

I guess there's a problem with paths, but I don't know how to solve it. Any help?