Why am I getting error saying "Could not find a version that satisfies the requirement Cython&q-CodePudding

The

What have I tried to fix this?

I installed cython to both my windows 10 (with pip install Cython and pip3 install Cython) and Ubunu inside VirtualBox. In every instance I got Requirement already satisfied....

I started new VirtualBox enviroment after installing Cython to windows 10.

I tried following these instructons/commands: https://stackoverflow.com/a/68452164/14694631

PS

In many posts I have seen people asking for full logs. Still after reading many issues on this subject I am still clueless on what the full log actually means. If error message provided is not the right part I can try to get the full log also if I can. Also I am new to Kivy, buildozer and VirtualBox and I've never used ubuntu for dev stuff before.

CodePudding user response：

I've seen a similar error before and seems that when installing python, some essential modules, ssl, weren't and are missing.

The Problem

pip seems to fail when trying to download Cython during the build, as it needs the ssl module in python which isn't available

The Solution

re-installing Python3 as it seems an essential library (ssl) wasn't installed.

You could use this question for help in fixing the ssl error in pip, and you should then retry the build

To re-install python, it says to:

Run sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev for dependancies

Download and unzip "Python-3.x.x.tar.xz" (your choice of version) from https://www.python.org/ftp/python/ into your home directory.

Open terminal in that directory and run: ./configure

Build and install: make && sudo make install

After re-installing python, check if pip works by running pip install --upgrade pip

If you need more clarifications, just comment.

CodePudding user response：

I found fix in the comments of the tutorial.

sudo apt install libssl-dev

rm -rf .buildozer

Deploy app again

Here is the whole comment by tutorial maker Erik Sanberg:

Try sudo apt install libssl-dev and then rm -rf .buildozer in the directory that has your buildozer.spec file. Then you can try deploying it again. It's a bug recently introduced that will be patched up soon I believe.