python3.5 --> python3.7 in Ubuntu 16.04 LTS

 

 

$ sudo apt-get install software-properties-common

$ sudo add-apt-repository ppa:deadsnakes/ppa

$ sudo apt-get update

$ sudo apt-get install python3.7

$ sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.7 1

$ sudo update-alternatives --config python3

$ sudo python3.7 get-pip.py                # pip3 update

(you can get "get-pip.py" file from https://packaging.python.org/tutorials/installing-packages/#ensure-you-can-run-pip-from-the-command-line)

 

if a problem is confronted like "This installation of MySQL is already upgraded to 5.7.29, use -force if you still need to run mysql_upgrade" and it cause hang, 

sudo killall mysqld