I installed fastaiv2 from repo, install fastcore from repo.
Ubuntu 18.04. Python 3.7.3
I just came across the same issue, when import fastai2.data in Kaggle environment.
Me too! Did you guys find a solution?
Probably the Jupiter is not using the interpreter that has fastai2.
What solved for me was, after following all the steps of http://dev.fast.ai getting started installing guide
I created a new Jupiter kernel with the fastai2 conda environment, using those commands below
$ source activate fastai2
(fastai2)$ ipython kernel install --name "fastai2-kernel" --user
after that, just
- refresh the browser which the Jupiter is running
- Change the kernel to “fastai2-kernel” like this…
And now your are good to go!
This link is not opening for me. Is it deprecated? 
Yes it is, but don’t worry now it’s straightforward to use the lib.
Just open a Google Colab notebook and run these two cells:
!pip install -Uqq fastbook
import fastbook
fastbook.setup_book()
from fastbook import *
from fastai.vision.widgets import *
That’s it!
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The docs are now at https://docs.fast.ai/, as fastai-v2 has been released, superseding fastai-v1.
Yijin
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just install the latest version of the fastai library that exist at your time and the latest version of the fastcore library
pip install fastai==2.. fastcore==1..
and when importing just import from fastai.vision.all import * do not put fastai2
that worked for me
i installed fastai version 2.5.5 and latest fastcore library and imported as
from fastai.vision.all import * and it worked