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sage manifold installation

I have trouble with sage manifold. Please help to fix this problem.

When I type

Manifold(2, 'M')

it shows

NameError                                 Traceback (most recent call last)
<ipython-input-1-9ad1037f0edd> in <module>()

----> 1 Manifold(Integer(2), 'M')

NameError: name 'Manifold' is not defined

I installed sage manifold using

sudo bash

I installed sage using the following commands:

sudo apt-add-repository -y ppa:aims/sagemath
sudo apt-get update
sudo apt-get install sagemath-upstream-binary