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doc: Add required Ubuntu packages for Python

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The package `libprotobuf-dev` contains files of the sort `google/protobuf/any.proto`. If the package is missing, then `python3 setup.py gen_protos` fails.

If the package `libgtk2.0-dev` is not installed before opencv is build, then the example f15da632de/mediapipe/python/solutions/pose.py doesn't work with a live cam and it fails with the following error message:

```
INFO: Created TensorFlow Lite XNNPACK delegate for CPU.
Traceback (most recent call last):
  File "pose.py", line 28, in <module>
    cv2.imshow('MediaPipe Pose', image)
cv2.error: OpenCV(3.4.11) /tmp/pip-install-5y2ipa9p/opencv-python/opencv/modules/highgui/src/window.cpp:658: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'
```
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mpuels 2020-11-07 16:04:37 +01:00 committed by GitHub
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docs/getting_started/building_examples.md
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@ -446,6 +446,8 @@ run `pip install mediapipe`, more convenient and much faster.
$ sudo apt install python3-dev $ sudo apt install python3-dev
$ sudo apt install python3-venv $ sudo apt install python3-venv
$ sudo apt install -y protobuf-compiler $ sudo apt install -y protobuf-compiler
$ sudo apt install libprotobuf-dev
$ sudo apt install libgtk2.0-dev
``` ```
```bash ```bash