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I am trying to install mininet-wifi. After downloading it, I have been using the following command to install it:

    sudo util/install.sh -Wlnfv

However, I keep getting the error:

    E: Unable to locate package python-pip

I have tried multiple times to download python-pip. I know mininet-wifi utilizes python 2 instead of python 3. I have tried to download python-pip using the command:

    sudo apt-get install python-pip

But that leads to the same error:

    E: Unable to locate package python-pip
Captain_Dev88
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    It might be a good idea to report this as a bug against mininet-wifi. Python 2 was end-of-lifed at the beginning of this year. It won't be receiving any further bug or security fixes. Projects should be using Python 3 now. – omajid May 24 '20 at 05:27
  • Try repository universe: https://stackoverflow.com/a/55423104/7976758 – phd May 24 '20 at 16:23
  • Mininet-WiFi supports Python3. This seems to be a problem with internal packages than any other thing. Worth mentioning that Ubuntu 20.04 does not (natively) support Python2 anymore. So you may want to install pip3. Unless there is a good reason to use Python2... – Ramon Fontes May 27 '20 at 23:29

7 Answers7

68

Pip for Python 2 is not included in the Ubuntu 20.04 repositories.
You need to install pip for Python 2 using the get-pip.py script.

1. Start by enabling the universe repository:

sudo add-apt-repository universe

2. Update the packages index and install Python 2:

sudo apt update 
sudo apt install python2

3. Use curl to download the get-pip.py script specific to python 2.7:

curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py

4. Once the repository is enabled, run the script as sudo user with python2 to install pip :

sudo python2 get-pip.py

Pip will be installed globally. If you want to install it only for your user, run the command without sudo. The script will also install setuptools and wheel, which allow you to install source distributions

Verify the installation by printing the pip version number:

pip2 --version

The output will look something like this:

 pip 20.0.2 from /usr/local/lib/python2.7/dist-packages/pip (python 2.7)
Chris
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muhive
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    That was a great solution. Thanks. I've encountered the error you mentioned as "If an error occurs". I think the problem is with using python2.7 with Ubuntu 20. – sundowatch Feb 08 '21 at 18:57
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    Its not working! ```root@farm:~# python --version Python 2.7.18 root@farm:~# python ./get-pip.py Traceback (most recent call last): File "./get-pip.py", line 24244, in main() File "./get-pip.py", line 199, in main bootstrap(tmpdir=tmpdir) File "./get-pip.py", line 82, in bootstrap from pip._internal.cli.main import main as pip_entry_point File "/tmp/tmpc8gemv/pip.zip/pip/_internal/cli/main.py", line 60 sys.stderr.write(f"ERROR: {exc}") ^ SyntaxError: invalid syntax``` – a0s Feb 10 '21 at 01:34
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    @a0s use `curl https://bootstrap.pypa.io/2.7/get-pip.py --output get-pip.py` as it has been said in the answer if you get an error. – Nwawel A Iroume Feb 13 '21 at 18:10
  • Done all the above commands. In my case pip3 has been installed but the error still exists – Tasneem Jul 03 '21 at 01:18
5

Since Python 2 is past its end-of-life, few packages for Python2 are included in 20.04. You have to install pip for Python 2 manually:

First, install Python 2:

sudo apt install python2

Then, follow https://pip.pypa.io/en/stable/installing/ , using python2:

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python2 get-pip.py

You can run the second step with sudo. If you don't use sudo, you'll need to change PATH, as suggested by the installation message. Alternatively, and possibly better (since it doesn't change PATH), use

python2 -m pip

whenever you need pip2.

9769953
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4

In my case, the curl command for downloading get-pip.py gave a syntax error on running sudo python get-pip.py.

But manual download by visiting https://bootstrap.pypa.io/ and downloading get-pip.py worked fine for me.

Greenonline
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Sanket Hire
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2

I've found that creating a virtualenv for Python 2.7 installs also pip

$ virtualenv -p python2 venv
$ . venv/bin/activate
$ pip --version
pip 20.0.2 from /home/.../venv/lib/python2.7/site-packages/pip (python 2.7)
vz0
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0

Put python3 instead ${PYPKG} in line 202, and instead python-pip in line 596 in file install.sh of mininet-wifi.

Kimiya Sharifk
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-2

To solve the problem of:

E: Unable to locate package python-pip

Run the package update index cmd:

sudo apt update

If not that, then python-pip-whl (which is also a package installer) is available in the universe repository, make sure that's installed and then run:

sudo apt-get install python-pip-whl
Yuuty
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    The [list of Python-related packages for 20.04](https://packages.ubuntu.com/focal/python/) shows no `python-pip` package. – 9769953 May 24 '20 at 03:48
  • Can `python-pip-whl` not install python packages from the [python package index](https://pypi.org) ? – Yuuty May 24 '20 at 04:00
-2

I specifically needed a Dockerfile file and this is what I have put inside so that it works without errors, I hope it will help someone.

This is Dockerfile file:

FROM ubuntu:latest
RUN apt-get update -y
RUN apt-get install -y python3 python3-dev
WORKDIR /app
COPY .  /app
ENV DEBUG=True
EXPOSE 80
HK boy
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Robert G.
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