When I want to install ipython with pip on my new Ubuntu 16.04 installation, I get this:

$ pip install ipython --user

Collecting ipython

  Downloading ipython-5.4.1-py2-none-any.whl (757kB)

    100% |████████████████████████████████| 757kB 821kB/s 

Collecting pickleshare (from ipython)

  Downloading pickleshare-0.7.4-py2.py3-none-any.whl

Collecting simplegeneric>0.8 (from ipython)

  Downloading simplegeneric-0.8.1.zip

Collecting traitlets>=4.2 (from ipython)

  Downloading traitlets-4.3.2-py2.py3-none-any.whl (74kB)

    100% |████████████████████████████████| 81kB 1.3MB/s 

Collecting backports.shutil-get-terminal-size; python_version == "2.7" (from ipython)

  Downloading backports.shutil_get_terminal_size-1.0.0-py2.py3-none-any.whl

Collecting decorator (from ipython)

  Downloading decorator-4.0.11-py2.py3-none-any.whl

Collecting pygments (from ipython)

  Downloading Pygments-2.2.0-py2.py3-none-any.whl (841kB)

    100% |████████████████████████████████| 849kB 829kB/s 

Collecting pexpect; sys_platform != "win32" (from ipython)

  Downloading pexpect-4.2.1-py2.py3-none-any.whl (55kB)

    100% |████████████████████████████████| 61kB 1.3MB/s 

Collecting pathlib2; python_version == "2.7" or python_version == "3.3" (from ipython)

  Downloading pathlib2-2.2.1-py2.py3-none-any.whl

Requirement already satisfied: setuptools>=18.5 in /usr/local/lib/python2.7/dist-packages (from ipython)

Collecting prompt-toolkit<2.0.0,>=1.0.4 (from ipython)

  Downloading prompt_toolkit-1.0.14-py2-none-any.whl (248kB)

    100% |████████████████████████████████| 256kB 1.1MB/s 

Collecting enum34; python_version == "2.7" (from traitlets>=4.2->ipython)

  Downloading enum34-1.1.6-py2-none-any.whl

Collecting six (from traitlets>=4.2->ipython)

  Downloading six-1.10.0-py2.py3-none-any.whl

Collecting ipython-genutils (from traitlets>=4.2->ipython)

  Downloading ipython_genutils-0.2.0-py2.py3-none-any.whl

Collecting ptyprocess>=0.5 (from pexpect; sys_platform != "win32"->ipython)

  Downloading ptyprocess-0.5.1-py2.py3-none-any.whl

Collecting scandir; python_version < "3.5" (from pathlib2; python_version == "2.7" or python_version == "3.3"->ipython)

  Downloading scandir-1.5.tar.gz

Collecting wcwidth (from prompt-toolkit<2.0.0,>=1.0.4->ipython)

  Downloading wcwidth-0.1.7-py2.py3-none-any.whl

Building wheels for collected packages: simplegeneric, scandir

  Running setup.py bdist_wheel for simplegeneric ... done

  Stored in directory: /home/manu/.cache/pip/wheels/7b/31/08/c85e74c84188cbec6a6827beec4d640f2bd78ae003dc1ec09d

  Running setup.py bdist_wheel for scandir ... error

  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-dPd3d3/scandir/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('

', '

');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpDLgZXopip-wheel- --python-tag cp27:

  running bdist_wheel

  running build

  running build_py

  creating build

  creating build/lib.linux-x86_64-2.7

  copying scandir.py -> build/lib.linux-x86_64-2.7

  running build_ext

  building '_scandir' extension

  creating build/temp.linux-x86_64-2.7

  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c _scandir.c -o build/temp.linux-x86_64-2.7/_scandir.o

  _scandir.c:14:20: 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



  ----------------------------------------

  Failed building wheel for scandir

  Running setup.py clean for scandir

Successfully built simplegeneric

Failed to build scandir

Installing collected packages: six, scandir, pathlib2, pickleshare, simplegeneric, enum34, decorator, ipython-genutils, traitlets, backports.shutil-get-terminal-size, pygments, ptyprocess, pexpect, wcwidth, prompt-toolkit, ipython

  Running setup.py install for scandir ... error

    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-dPd3d3/scandir/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('

', '

');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-H_p3nS-record/install-record.txt --single-version-externally-managed --compile --user --prefix=:

    running install

    running build

    running build_py

    creating build

    creating build/lib.linux-x86_64-2.7

    copying scandir.py -> build/lib.linux-x86_64-2.7

    running build_ext

    building '_scandir' extension

    creating build/temp.linux-x86_64-2.7

    x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c _scandir.c -o build/temp.linux-x86_64-2.7/_scandir.o

    _scandir.c:14:20: 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



    ----------------------------------------

Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-dPd3d3/scandir/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('

', '

');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-H_p3nS-record/install-record.txt --single-version-externally-managed --compile --user --prefix=" failed with error code 1 in /tmp/pip-build-dPd3d3/scandir/

The interesting line is:

Failed building wheel for scandir

How could I get rid of this?