UbuntuにpipでDaskがインストールできない

```
pip install "dask[complete]"
```

したのに、以下のようなエラーが出る。

```
 ERROR: Command errored out with exit status 1:
   command: /home/xxx/.virtualenvs/main/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-r_tsl8qg/psutil/setup.py'"'"'; __file__='"'"'/tmp/pip-install-r_tsl8qg/psutil/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-2vmihue5 --python-tag cp36
       cwd: /tmp/pip-install-r_tsl8qg/psutil/
  Complete output (44 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.6
  creating build/lib.linux-x86_64-3.6/psutil
  copying psutil/_pslinux.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_psaix.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_psposix.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_pswindows.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/__init__.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_pssunos.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_compat.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_common.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_psosx.py -> build/lib.linux-x86_64-3.6/psutil
  copying psutil/_psbsd.py -> build/lib.linux-x86_64-3.6/psutil
  creating build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/runner.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_misc.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_linux.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_sunos.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/__init__.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_connections.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_osx.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_aix.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/__main__.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_contracts.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_posix.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_unicode.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_windows.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_process.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_system.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_bsd.py -> build/lib.linux-x86_64-3.6/psutil/tests
  copying psutil/tests/test_memory_leaks.py -> build/lib.linux-x86_64-3.6/psutil/tests
  running build_ext
  building 'psutil._psutil_linux' extension
  creating build/temp.linux-x86_64-3.6
  creating build/temp.linux-x86_64-3.6/psutil
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=565 -DPSUTIL_LINUX=1 -I/usr/include/python3.6m -I/home/xxx/.virtualenvs/main/include/python3.6m -c psutil/_psutil_common.c -o build/temp.linux-x86_64-3.6/psutil/_psutil_common.o
  psutil/_psutil_common.c:9:10: fatal error: Python.h: No such file or directory
   #include <Python.h>
            ^~~~~~~~~~
  compilation terminated.
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for psutil
```

これは、Pythonのヘッダファイルがないため。

2系ならば

```
sudo apt install python-dev
```

3系ならば

```
sudo apt install python3-dev
```

で解決できる。