Thanks for the reply. But still having same errror, already tried under virtual environment. Can you please provide exact commands for  manual installation of libydk. ... View more

Same problem here : u buntu@ubuntu-xenial:/$ pip install ydk-models-cisco-ios-xr Collecting ydk-models-cisco-ios-xr   Downloading ydk_models_cisco_ios_xr-6.3.1-py2.py3-none-any.whl (19.9MB)     100% |████████████████████████████████| 19.9MB 39kB/s Collecting ydk-models-ietf>=0.1.3 (from ydk-models-cisco-ios-xr)   Downloading ydk_models_ietf-0.1.4-py2.py3-none-any.whl (232kB)     100% |████████████████████████████████| 235kB 364kB/s Collecting ydk>=0.6.1 (from ydk-models-cisco-ios-xr)   Downloading ydk-0.6.1.tar.gz Collecting pybind11>=2.1.1 (from ydk>=0.6.1->ydk-models-cisco-ios-xr)   Downloading pybind11-2.2.1-py2.py3-none-any.whl (143kB)     100% |████████████████████████████████| 153kB 545kB/s Building wheels for collected packages: ydk   Running setup.py bdist_wheel for ydk ... error   Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-iYTs2_/ydk/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/tmpNwpuFXpip-wheel- --python-tag cp27:   running bdist_wheel   running build   running build_py   creating build   creating build/lib.linux-x86_64-2.7   creating build/lib.linux-x86_64-2.7/ydk   copying ydk/exthook.py -> build/lib.linux-x86_64-2.7/ydk   copying ydk/__init__.py -> build/lib.linux-x86_64-2.7/ydk   creating build/lib.linux-x86_64-2.7/ydk/models   copying ydk/models/__init__.py -> build/lib.linux-x86_64-2.7/ydk/models   creating build/lib.linux-x86_64-2.7/ydk/types   copying ydk/types/__init__.py -> build/lib.linux-x86_64-2.7/ydk/types   copying ydk/types/py_types.py -> build/lib.linux-x86_64-2.7/ydk/types   creating build/lib.linux-x86_64-2.7/ydk/logging   copying ydk/logging/__init__.py -> build/lib.linux-x86_64-2.7/ydk/logging   creating build/lib.linux-x86_64-2.7/ydk/providers   copying ydk/providers/__init__.py -> build/lib.linux-x86_64-2.7/ydk/providers   copying ydk/providers/codec_provider.py -> build/lib.linux-x86_64-2.7/ydk/providers   creating build/lib.linux-x86_64-2.7/ydk/services   copying ydk/services/crud_service.py -> build/lib.linux-x86_64-2.7/ydk/services   copying ydk/services/codec_service.py -> build/lib.linux-x86_64-2.7/ydk/services   copying ydk/services/executor_service.py -> build/lib.linux-x86_64-2.7/ydk/services   copying ydk/services/__init__.py -> build/lib.linux-x86_64-2.7/ydk/services   copying ydk/services/netconf_service.py -> build/lib.linux-x86_64-2.7/ydk/services   creating build/lib.linux-x86_64-2.7/ydk/entity_utils   copying ydk/entity_utils/__init__.py -> build/lib.linux-x86_64-2.7/ydk/entity_utils   creating build/lib.linux-x86_64-2.7/ydk/path   copying ydk/path/__init__.py -> build/lib.linux-x86_64-2.7/ydk/path   creating build/lib.linux-x86_64-2.7/ydk/filters   copying ydk/filters/__init__.py -> build/lib.linux-x86_64-2.7/ydk/filters   creating build/lib.linux-x86_64-2.7/ydk/ext   copying ydk/ext/__init__.py -> build/lib.linux-x86_64-2.7/ydk/ext   creating build/lib.linux-x86_64-2.7/ydk/errors   copying ydk/errors/__init__.py -> build/lib.linux-x86_64-2.7/ydk/errors   copying ydk/errors/error_handler.py -> build/lib.linux-x86_64-2.7/ydk/errors   creating build/lib.linux-x86_64-2.7/ydk/path/sessions   copying ydk/path/sessions/netconf_session.py -> build/lib.linux-x86_64-2.7/ydk/path/sessions   copying ydk/path/sessions/__init__.py -> build/lib.linux-x86_64-2.7/ydk/path/sessions   copying ydk/path/sessions/restconf_session.py -> build/lib.linux-x86_64-2.7/ydk/path/sessions   running build_ext   Traceback (most recent call last):     File "<string>", line 1, in <module>     File "/tmp/pip-build-iYTs2_/ydk/setup.py", line 157, in <module>       zip_safe=False,     File "/usr/lib/python2.7/distutils/core.py", line 151, in setup       dist.run_commands()     File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands       self.run_command(cmd)     File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command       cmd_obj.run()     File "/usr/lib/python2.7/dist-packages/wheel/bdist_wheel.py", line 179, in run       self.run_command('build')     File "/usr/lib/python2.7/distutils/cmd.py", line 326, in run_command       self.distribution.run_command(command)     File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command       cmd_obj.run()     File "/usr/lib/python2.7/distutils/command/build.py", line 128, in run       self.run_command(cmd_name)     File "/usr/lib/python2.7/distutils/cmd.py", line 326, in run_command       self.distribution.run_command(command)     File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command       cmd_obj.run()     File "/tmp/pip-build-iYTs2_/ydk/setup.py", line 66, in run       ", ".join(e.name for e in self.extensions))   RuntimeError: CMake must be installed to build the following extensions: ydk_   ----------------------------------------   Failed building wheel for ydk   Running setup.py clean for ydk Failed to build ydk Installing collected packages: pybind11, ydk, ydk-models-ietf, ydk-models-cisco-ios-xr Exception: Traceback (most recent call last):   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main     status = self.run(options, args)   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/commands/install.py", line 342, in run     prefix=options.prefix_path,   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/req/req_set.py", line 784, in install     **kwargs   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/req/req_install.py", line 851, in install     self.move_wheel_files(self.source_dir, root=root, prefix=prefix)   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/req/req_install.py", line 1064, in move_wheel_files     isolated=self.isolated,   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/wheel.py", line 345, in move_wheel_files     clobber(source, lib_dir, True)   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/wheel.py", line 316, in clobber     ensure_dir(destdir)   File "/home/ubuntu/.local/lib/python2.7/site-packages/pip/utils/__init__.py", line 83, in ensure_dir     os.makedirs(path)   File "/usr/lib/python2.7/os.py", line 157, in makedirs     mkdir(name, mode) OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/pybind11-2.2.1.dist-info' ubuntu@ubuntu-xenial:/$ Any help ? Thanks ... View more