Question: I accidentally installed TensorFlow for Ubuntu/Linux 64-bit, GPU enabled.
When I installed with Linux 64-bit CPU only, I am getting Segmentation fault while importing tensorflow from python console.

Answer: 
Depends on how you install it considering the fact that there are multiple ways to do it [here](https://www.tensorflow.org/versions/r0.8/get_started/os_setup.html). Most generic way people do it is through pip, check using:

```
sudo pip show tensorflow

```

Uninstall using:

```
sudo pip uninstall protobuf
sudo pip uninstall tensorflow

```

Install it using:

```
sudo pip install --upgrade https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.8.0-cp27-none-linux_x86_64.whl

```
When running in `conda` env or any virtual env sudo doesn't work. So you can use:

```
python3 -m pip uninstall protobuf    
python3 -m pip uninstall tensorflow-gpu

```

`python3 -m` is safest way to ensure that you are using `pip3` and not `pip2`.