Couldn't find any package by glob 'Python-3.7.0'

Question

I got a E: Couldn't find any package by glob 'Python-3.7.0' error message when trying to install Python 3.7 in Ubuntu 16.04

ns3@ns3-virtual-machine:~$ sudo apt install Python-3.7.0
Reading package lists... Done
Building dependency tree       
Reading state information... Done 
E: Unable to locate package Python-3.7.0
E: Couldn't find any package by glob 'Python-3.7.0'
E: Couldn't find any package by regex 'Python-3.7.0'

ns3@ns3-virtual-machine:~$ sudo apt install Python-3.7
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package Python-3.7
E: Couldn't find any package by glob 'Python-3.7'
E: Couldn't find any package by regex 'Python-3.7'
ns3@ns3-virtual-machine:~$ sudo apt install python3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3 is already the newest version (3.5.1-3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
ns3@ns3-virtual-machine:~$ python --version
Python 2.7.12
ns3@ns3-virtual-machine:~$ apt policy python-3.7
N: Unable to locate package python-3.7
N: Couldn't find any package by glob 'python-3.7'
N: Couldn't find any package by regex 'python-3.7
ns3@ns3-virtual-machine:~$ 

Solution

In Ubuntu 16.04 open the terminal and type:

sudo add-apt-repository ppa:deadsnakes/ppa   
sudo apt-get update   
sudo apt install python3.7    

Alternatively you can also install Python3.8 in Ubuntu 16.04 with the following commands:

sudo add-apt-repository ppa:deadsnakes/ppa   
sudo apt-get update   
sudo apt install python3.8  

To show the Python 3.7 version run the following command:

python3.7 -V

To start the Python 3.7 interpreter run the following command:

python3.7  

To exit the Python 3.x interpreter run the following command:

exit   

Comments

[guiverc]

Please don't include pictures of text, we cannot copy/paste from pictures - so include text. I can't check as I can't copy - but python should be all lower case (note: as I couldn't copy/paste due to picture - I didn't look for other errors)

[Gulzar]

After having done that, still I am getting E: Unable to locate package python3.7 E: Couldn't find any package by glob 'python3.7' E: Couldn't find any package by regex 'python3.7'

[karel]

@Gulzar The reason for the error message is that 16.04 is end of life. For the solution to this error message please read the answers to How to install software or upgrade from an old unsupported release?.