How do I install a different Python version using apt-get?

Felix Krull runs a PPA offering basically any version of Python (seriously, there is 2.3.7 build for vivid...) for many Ubuntu releases at https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa.

Do the usual:

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.5

It will not overwrite your existing python3.4 which is still symlinked as python3.

DON'T change the symlink! There are apparently many system functions that don't work properly with python3.5.

I tried this and afterwards couldn't open a terminal, software updater,...

cd /usr/bin
sudo rm python3

The upgrade to Wily will adapt the meta-package python3 to point to python3.5. I don't expect any breakage, but at this point the foreign repository is not needed anymore. So to be really safe, you can purge the PPA before doing the upgrade.

This Youtube link helped me to install it.

The steps are:

sudo apt-get install libssl-dev openssl
wget https://www.python.org/ftp/python/3.5.0/Python-3.5.0.tgz
tar xzvf Python-3.5.0.tgz
cd Python-3.5.0
./configure
make
sudo make install

To check if python is installed type python3.5 else:

sudo ln -fs /opt/Python-3.5.0/Python /usr/bin/python3.5

Just follow this steps (tested) :

Step 1 – Install Required Packages

Use the following command to install prerequisites for Python before installing it.

sudo apt-get install build-essential checkinstall
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev

Step 2 – Download Python 3.5.2

Download Python using following command from python official site. You can also download latest version in place of specified below.

cd /usr/src
sudo wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tgz

Now extract the downloaded package.

sudo tar xzf Python-3.5.2.tgz

Step 3 – Compile Python Source

Use below set of commands to compile python source code on your system using altinstall.

cd Python-3.5.2
sudo ./configure
sudo make altinstall

make altinstall is used to prevent replacing the default python binary file /usr/bin/python.

Step 4 – Check the Python Version

Check the latest version installed of python using below command.

$ python3.5 -V

Python 3.5.2

Source.