Recommend a very useful tool apt-fast.

The default apt-get install can sometimes be very slow to download, especially when installing some PPA packages. Apt-fast through the use of multithreading download, to speed up APT, speed has been greatly improved, especially for domestic friends.

Installation process:

sudo add-apt-repository ppa:saiarcot895/myppa
sudo apt-get update
sudo apt-get -y install apt-fast
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You may enter a graphical interface, so click ESC to exit altogether.

Install Python3.7, very fast, see:

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-fast install python37.
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OK, that’s all!