FRESH INSTALL PYTHON 2.7 UBUNTU UPGRADE

Pip 8.1.1 from /usr/lib/python3/dist-packages (python 3.5)ДЄnd one last thing before you can go and start installing all your favorite python PyPI modules: you'll probably have to upgrade pip itself (both pip2 and pip3, separately also, it doesn't matter if pip is invoked via the python executables or the pip executables, the actual upgrades are stored in /usr/lib): $ sudo -H python2 -m pip install -upgrade pip The resulting versions: $ type python python2 python3 pip pip2 pip3 Libpython3-dev libpython3.5-dev python3-dev python3-pip python3-setuptools python3-wheel python3.5-devД upgraded, 7 newly installed, 0 to remove and 0 not upgraded.ДЄfter this operation, 55.2 MB of additional disk space will be used. Libpython3-dev libpython3.5-dev python3-dev python3-setuptools python3-wheel python3.5-dev Pip 8.1.1 from /usr/lib/python2.7/dist-packages (python 2.7)ДЄfter installing pip3, $ sudo apt-get install python3-pip You'll also want to sudo apt-get install python3-pip before you install, you have: $ type pip pip2 pip3 Python-pip-whl python-pkg-resources python-setuptools python-wheel python2.7-devД upgraded, 49 newly installed, 0 to remove and 0 not upgraded.ДЄfter this operation, 169 MB of additional disk space will be used.ДЄn interesting thing happens as a result of this: you now have the 'standard' (and PEP recommended) python2 and python3 (which are just symlinks to python 2.7 and python 3.5): $ type python3 python2 python python2.7 python3.5 Manpages-dev python python-all python-all-dev python-dev python-minimal python-pip Libcilkrts5-dbg libmpx0-dbg libquadmath0-dbg glibc-doc libstdc++-5-doc make-doc python-doc Libgomp1-dbg libitm1-dbg libatomic1-dbg libasan2-dbg liblsan0-dbg libtsan0-dbg libubsan0-dbg Python-pkg-resources python-setuptools python-wheel python2.7-devД«inutils-doc debian-keyring g++-multilib g++-5-multilib gcc-5-doc libstdc++6-5-dbg gcc-multilibДЄutoconf automake libtool flex bison gdb gcc-doc gcc-5-multilib gcc-5-locales libgcc1-dbg Manpages-dev python python-all python-all-dev python-dev python-minimal python-pip-whl Libpython2.7-dev libquadmath0 libstdc++-5-dev libtsan0 libubsan0 linux-libc-dev make Libgomp1 libitm1 liblsan0 libmpx0 libpython-all-dev libpython-dev libpython-stdlib libpython2.7 Libcc1-0 libcilkrts5 libdpkg-perl libexpat1-dev libfakeroot libfile-fcntllock-perl libgcc-5-dev

Libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan2 libatomic1 libc-dev-bin libc6-dev The installation via apt-get is sure to install the required dependencies e.g, here's the output for installing pip2: $ sudo apt-get install python-pipД«inutils build-essential dpkg-dev fakeroot g++ g++-5 gcc gcc-5 libalgorithm-diff-perl You'll need both python-pip for the Python 2.7 pip and the python3-pip for the Python 3 pip. Python3-pip - alternative Python package installer - Python 3 version of the package Python-pip-whl - alternative Python package installer Python-pip - alternative Python package installer So to install pip, again, it's as easy as sudo apt-get install python-pip : $ sudo apt-cache search -n pip | egrep '^python*-pip' Libpython2.7-minimal libpython2.7-stdlib python2.7 python2.7-minimalД upgraded, 4 newly installed, 0 to remove and 0 not upgraded.ДЄfter this operation, 15.8 MB of additional disk space will be used.ДЄfter installing python 2.7, $ type python3 python2.7 python3.5 python2 pythonД«ut there's still a problem, since you can't yet install PyPI modules via pip - e.g., if you want jupyter notebook, or the latest scipy or numpy (etc), you'll want to install pip and then pip install those, and still turning to apt-get to install any needed system dependencies, like graphviz or core system libraries. The following NEW packages will be installed: Libpython2.7-minimal libpython2.7-stdlib python2.7-minimal

The following additional packages will be installed:

The initial output of installing python 2.7 is as follows: $ sudo apt-get install python2.7 Installing python 2.7 is as easy as: $ sudo apt-get install python2.7 Note: before continuing, you will probably want to do a quick sudo apt-get update, sudo apt-get upgrade, and sudo apt-get dist-upgrade (please do note exactly what these commands are in fact doing I'm assuming a fresh install here.) The program 'python' can be found in the following packages: On a fresh install (note that there's not even a python executable): $ type python3 python2 python Continuing to document this for the latest Ubuntu releases 1 : for Ubuntu 16.04.1 server, the default Python is version 3.5, and Python 2.7 is not installed by default.

Fresh install python 2.7 ubuntu