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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 sm-install.sh

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

Yes I used PPA. Now what is the procedure to remove it properly and install again?

Thank you for your answer. Now sage cannot be accessed in terminal. But the directory is still there. Can I remove that too. Because it shows error when I tried to install sage later. I want to install it properly along with sage manifold.

I installed sage on Ubuntu 14.04. how do i uninstall/remove it completely?

SageMath Version 6.7, Release Date: 2015-05-17

Type "notebook()" for the browser-based notebook interface.

Type "help()" for help.

sage:

Thank you for your answer. It shows

sys:1: RuntimeWarning: not adding '/usr/lib/sagemath/src/doc/common' to sys.path since its status cannot be determined

python: can't open file '/usr/lib/sagemath/src/doc/common/builder.py': [Errno 2] No such file or directory

sys:1: RuntimeWarning: not adding '/usr/lib/sagemath/src/doc/common' to sys.path since its status cannot be determined

python: can't open file '/usr/lib/sagemath/src/doc/common/builder.py': [Errno 2] No such file or directory

I installed sage manifold using the command

sudo bash sm-install.sh

And python using the commands

sudo add-apt-repository ppa:fkrull/deadsnakes

sudo apt-get update

sudo apt-get install python2.7

Then checked using

Manifold(2, 'M')

But it shows

name 'Manifold' is not defined

What is the problem?