Using Ubuntu 16.04, I have a problem with python3
$ python --version
Python 2.7.12
$ sudo apt-get install python3
Reading package lists... Done
Building dependency tree
Reading state information... Done
python3 is already the newest version (3.5.1-3).
The following packages were automatically installed and are no longer
required:
linux-headers-4.8.0-53 linux-headers-4.8.0-53-generic
linux-image-4.8.0-53-generic linux-image-extra-4.8.0-53-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
$ python3
bash: /usr/lib/command-not-found: /usr/bin/python3: bad interpreter: No such file or directory
