[LINUX] Dealing with pip and related installation errors on Ubuntu 18.04

Trying to install xxx with pip3, for example

ipywidgets 6.0.0 requires widgetsnbextension~=2.0.0, which is not installed.

If you get an error such as

pip3 install --user --upgrade ipywidgets

Deal with.

You are using pip version 10.0.0, however version 19.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

If it appears in the final sentence of the execution result and disturbs you

pip3 install --user --upgrade pip

Solved with. The error no longer appears.

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