FileNotFoundError: [Errno 2] No such file or directory: ':/usr/local/cuda:/usr/local/cuda-10.1/bin/nvcc': ':/usr/local/cuda:/usr/local/cuda-10.1/bin/nvcc'

I have been trying to fix this issue all day, to no avail. These are the specs of what I have installed on my system:
Ubuntu 16.04
NVIDIA-SMI 418.67
nvcc --version : 10.1
pytorch 1.1.0
gcc 5.5.0

The main issue looks to be

FileNotFoundError: [Errno 2] No such file or directory: ':/usr/local/cuda:/usr/local/cuda-10.1/bin/nvcc': ':/usr/local/cuda:/usr/local/cuda-10.1/bin/nvcc

However, running nvcc --version returns 10.1 as the response.

Any insight into how to fix this issue and install apex would be greatly appreciated!

/home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/pip/_internal/commands/install.py:244: UserWarning: Disabling all use of wheels due to the use of --build-options / --global-options / --install-options.
  cmdoptions.check_install_build_global(options)
Created temporary directory: /tmp/pip-ephem-wheel-cache-j8o7yjqq
Created temporary directory: /tmp/pip-req-tracker-ra6eqjk1
Created requirements tracker '/tmp/pip-req-tracker-ra6eqjk1'
Created temporary directory: /tmp/pip-install-s6mei5xx
Processing /home/cameron/apex
  Created temporary directory: /tmp/pip-req-build-qudffubt
  Added file:///home/cameron/apex to build tracker '/tmp/pip-req-tracker-ra6eqjk1'
    Running setup.py (path:/tmp/pip-req-build-qudffubt/setup.py) egg_info for package from file:///home/cameron/apex
    Running command python setup.py egg_info
    torch.__version__  =  1.1.0
    running egg_info
    creating pip-egg-info/apex.egg-info
    writing pip-egg-info/apex.egg-info/PKG-INFO
    writing dependency_links to pip-egg-info/apex.egg-info/dependency_links.txt
    writing top-level names to pip-egg-info/apex.egg-info/top_level.txt
    writing manifest file 'pip-egg-info/apex.egg-info/SOURCES.txt'
    reading manifest file 'pip-egg-info/apex.egg-info/SOURCES.txt'
    writing manifest file 'pip-egg-info/apex.egg-info/SOURCES.txt'
  Source in /tmp/pip-req-build-qudffubt has version 0.1, which satisfies requirement apex==0.1 from file:///home/cameron/apex
  Removed apex==0.1 from file:///home/cameron/apex from build tracker '/tmp/pip-req-tracker-ra6eqjk1'
Skipping bdist_wheel for apex, due to binaries being disabled for it.
Installing collected packages: apex
  Found existing installation: apex 0.1
    Uninstalling apex-0.1:
      Created temporary directory: /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/~pex-0.1.dist-info
      Removing file or directory /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/apex-0.1.dist-info/
      Created temporary directory: /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/~pex
      Removing file or directory /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/apex/
      Successfully uninstalled apex-0.1
  Created temporary directory: /tmp/pip-record-z2oq0pnq
    Running command /home/cameron/anaconda2/envs/py36/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-req-build-qudffubt/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' --cpp_ext --cuda_ext install --record /tmp/pip-record-z2oq0pnq/install-record.txt --single-version-externally-managed --compile
    torch.__version__  =  1.1.0
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-req-build-qudffubt/setup.py", line 65, in <module>
        check_cuda_torch_binary_vs_bare_metal(torch.utils.cpp_extension.CUDA_HOME)
      File "/tmp/pip-req-build-qudffubt/setup.py", line 38, in check_cuda_torch_binary_vs_bare_metal
        raw_output = subprocess.check_output([cuda_dir + "/bin/nvcc", "-V"], universal_newlines=True)
      File "/home/cameron/anaconda2/envs/py36/lib/python3.6/subprocess.py", line 356, in check_output
        **kwargs).stdout
      File "/home/cameron/anaconda2/envs/py36/lib/python3.6/subprocess.py", line 423, in run
        with Popen(*popenargs, **kwargs) as process:
      File "/home/cameron/anaconda2/envs/py36/lib/python3.6/subprocess.py", line 729, in __init__
        restore_signals, start_new_session)
      File "/home/cameron/anaconda2/envs/py36/lib/python3.6/subprocess.py", line 1364, in _execute_child
        raise child_exception_type(errno_num, err_msg, err_filename)
    FileNotFoundError: [Errno 2] No such file or directory: ':/usr/local/cuda:/usr/local/cuda-10.1/bin/nvcc': ':/usr/local/cuda:/usr/local/cuda-10.1/bin/nvcc
  Running setup.py install for apex ... error
  Rolling back uninstall of apex
  Moving to /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/apex-0.1.dist-info/
   from /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/~pex-0.1.dist-info
  Moving to /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/apex/
   from /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/~pex
  Replacing /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/apex-0.1.dist-info/ from /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/~pex-0.1.dist-info
  Replacing /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/apex/ from /home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/~pex
Cleaning up...
  Removing source in /tmp/pip-req-build-qudffubt
Removed build tracker '/tmp/pip-req-tracker-ra6eqjk1'
ERROR: Command "/home/cameron/anaconda2/envs/py36/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-req-build-qudffubt/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' --cpp_ext --cuda_ext install --record /tmp/pip-record-z2oq0pnq/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-req-build-qudffubt/
Exception information:
Traceback (most recent call last):
  File "/home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 178, in main
    status = self.run(options, args)
  File "/home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 414, in run
    use_user_site=options.use_user_site,
  File "/home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/pip/_internal/req/__init__.py", line 58, in install_given_reqs
    **kwargs
  File "/home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/pip/_internal/req/req_install.py", line 951, in install
    spinner=spinner,
  File "/home/cameron/anaconda2/envs/py36/lib/python3.6/site-packages/pip/_internal/utils/misc.py", line 776, in call_subprocess
    % (command_desc, proc.returncode, cwd))
pip._internal.exceptions.InstallationError: Command "/home/cameron/anaconda2/envs/py36/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-req-build-qudffubt/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' --cpp_ext --cuda_ext install --record /tmp/pip-record-z2oq0pnq/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-req-build-qudffubt/
1 location(s) to search for versions of pip:
* https://pypi.org/simple/pip/
Getting page https://pypi.org/simple/pip/
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/pip/ HTTP/1.1" 200 11244
Analyzing links from page https://pypi.org/simple/pip/
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Start with setup.py lines 38 and 65, then inspect how torch.utils.cpp_extension.CUDA_HOME is used to form the nvcc path. Reproduce the reported pip install command with the listed environment details and determine why the path contains multiple CUDA entries; done means the installation no longer raises this FileNotFoundError.