root@azh:~/Downloads/pythonnet-2.1.0# pip3 install pythonnet
The directory '/home/azh/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/azh/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting pythonnet
  Downloading pythonnet-2.1.0.zip (841kB)
    100% |████████████████████████████████| 849kB 1.2MB/s 
Installing collected packages: pythonnet
  Running setup.py install for pythonnet ... error
    Complete output from command /usr/bin/python3.5 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-ropnhfme/pythonnet/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-j69ui9dw-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_ext
    Installing 'UnmanagedExports 1.2.6'.
    Installing 'NUnit 2.6.2'.
    Successfully installed 'NUnit 2.6.2'.
    Successfully installed 'UnmanagedExports 1.2.6'.
    /usr/bin/python3.5: can't open file 'tools/geninterop/geninterop.py': [Errno 2] No such file or directory
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-ropnhfme/pythonnet/setup.py", line 357, in <module>
        setup_requires=setup_requires
      File "/usr/lib/python3.5/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/lib/python3.5/distutils/dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.5/dist-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/usr/lib/python3.5/distutils/command/install.py", line 583, in run
        self.run_command('build')
      File "/usr/lib/python3.5/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/lib/python3.5/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/usr/lib/python3.5/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/lib/python3.5/distutils/command/build_ext.py", line 338, in run
        self.build_extensions()
      File "/usr/lib/python3.5/distutils/command/build_ext.py", line 447, in build_extensions
        self._build_extensions_serial()
      File "/usr/lib/python3.5/distutils/command/build_ext.py", line 472, in _build_extensions_serial
        self.build_extension(ext)
      File "/tmp/pip-build-ropnhfme/pythonnet/setup.py", line 168, in build_extension
        _check_output([sys.executable, geninterop, interop_file])
      File "/tmp/pip-build-ropnhfme/pythonnet/setup.py", line 283, in _check_output
        raise CalledProcessError(retcode, cmd, output=output)
    subprocess.CalledProcessError: Command '['/usr/bin/python3.5', 'tools/geninterop/geninterop.py', 'src/runtime/interop35m.cs']' returned non-zero exit status 2

    ----------------------------------------
Command "/usr/bin/python3.5 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-ropnhfme/pythonnet/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-j69ui9dw-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-ropnhfme/pythonnet/
root@azh:~/Downloads/pythonnet-2.1.0# exit
exit
azh@azh:~/Downloads/pythonnet-2.1.0$ 
azh@azh:~/Downloads/pythonnet-2.1.0$ pip install pythonnet
Collecting pythonnet
  Downloading pythonnet-2.1.0.zip (841kB)
    100% |████████████████████████████████| 849kB 1.1MB/s 
Installing collected packages: pythonnet
  Running setup.py install for pythonnet ... error
    Complete output from command /usr/bin/python3.5 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-jv9oykad/pythonnet/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-tshgkshh-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_ext
    Installing 'UnmanagedExports 1.2.6'.
    Installing 'NUnit 2.6.2'.
    Could not find a part of the path "/tmp/nuget/2bi76z0q.44m/license.txt".
    Could not find a part of the path "/tmp/nuget/58q8hn2f.z9m/lib/net/RGiesecke.DllExport.Metadata.dll".
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-jv9oykad/pythonnet/setup.py", line 357, in <module>
        setup_requires=setup_requires
      File "/usr/lib/python3.5/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/lib/python3.5/distutils/dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.5/dist-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/usr/lib/python3.5/distutils/command/install.py", line 583, in run
        self.run_command('build')
      File "/usr/lib/python3.5/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/lib/python3.5/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/usr/lib/python3.5/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib/python3.5/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/lib/python3.5/distutils/command/build_ext.py", line 338, in run
        self.build_extensions()
      File "/usr/lib/python3.5/distutils/command/build_ext.py", line 447, in build_extensions
        self._build_extensions_serial()
      File "/usr/lib/python3.5/distutils/command/build_ext.py", line 472, in _build_extensions_serial
        self.build_extension(ext)
      File "/tmp/pip-build-jv9oykad/pythonnet/setup.py", line 122, in build_extension
        self._install_packages()
      File "/tmp/pip-build-jv9oykad/pythonnet/setup.py", line 231, in _install_packages
        check_call(cmd, shell=use_shell)
      File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command 'mono tools/nuget/nuget.exe restore pythonnet.sln -o packages' returned non-zero exit status 1

    ----------------------------------------
Command "/usr/bin/python3.5 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-jv9oykad/pythonnet/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-tshgkshh-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-jv9oykad/pythonnet/