apt-get install software-properties-common python-software-properties

add-apt-repository ppa:jonathonf/python-3.6

This PPA has been removed from public access as part of a protest against the abuse of open-source projects by large companies. For more detail visit the main page here: https://launchpad.net/~jonathonf

If you are a company and you would like this PPA to continue then let me know your preferred route for contributions and I will arrange something.

If we have already been in contact then ping me your Launchpad ID and I will add you to a private PPA in the meantime.
 More info: https://launchpad.net/~jonathonf/+archive/ubuntu/python-3.6
Press [ENTER] to continue or ctrl-c to cancel adding it

# apt-get install python3.6
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package python3.6
E: Couldn't find any package by glob 'python3.6'
E: Couldn't find any package by regex 'python3.6'

add-apt-repository ppa:deadsnakes/ppa

cd /opt
wget https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz

tar -xvf Python-3.6.3.tgz

cd Python-3.6.3
./configure
make
make install

zipimport.ZipImportError: can't decompress data; zlib not available

apt-get install zlib1g-dev

# python3.6 -V
Python 3.6.3

python -V
python3 -V
python3.6 -V

update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1
update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.6 2
update-alternatives --config python3

There are 2 choices for the alternative python3 (providing /usr/bin/python3).

  Selection    Path                      Priority   Status
------------------------------------------------------------
* 0            /usr/local/bin/python3.6   2         auto mode
  1            /usr/bin/python3.5         1         manual mode
  2            /usr/local/bin/python3.6   2         manual mode

Press <enter> to keep the current choice[*], or type selection number: 

# python3 -V
Python 3.6.3

Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python3.6/site-packages/pip/commands/install.py", line 272, in run
    with self._build_session(options) as session:
  File "/usr/local/lib/python3.6/site-packages/pip/basecommand.py", line 72, in _build_session
    insecure_hosts=options.trusted_hosts,
  File "/usr/local/lib/python3.6/site-packages/pip/download.py", line 329, in __init__
    self.headers["User-Agent"] = user_agent()
  File "/usr/local/lib/python3.6/site-packages/pip/download.py", line 93, in user_agent
    from pip._vendor import distro
  File "/usr/local/lib/python3.6/site-packages/pip/_vendor/distro.py", line 1050, in <module>
    _distro = LinuxDistribution()
  File "/usr/local/lib/python3.6/site-packages/pip/_vendor/distro.py", line 594, in __init__
    if include_lsb else {}
  File "/usr/local/lib/python3.6/site-packages/pip/_vendor/distro.py", line 931, in _get_lsb_release_info
    raise subprocess.CalledProcessError(code, cmd, stdout, stderr)
subprocess.CalledProcessError: Command 'lsb_release -a' returned non-zero exit status 1.

# find / -name 'lsb_release.py'
/usr/lib/python3/dist-packages/lsb_release.py
/usr/lib/python2.7/dist-packages/lsb_release.py
/usr/share/pyshared/lsb_release.py
# find /usr -name python3.6
/usr/local/bin/python3.6
/usr/local/lib/python3.6
# cp /usr/lib/python3/dist-packages/lsb_release.py /usr/local/lib/python3.6/