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[docs] do not tell users to delete /usr/bin/python3 #11790

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[docs] do not tell users to delete /usr/bin/python3 #11790

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23 changes: 11 additions & 12 deletions documentation/2.quick-start/quick_start_qemu/quick_start_qemu_linux.md
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Expand Up @@ -50,23 +50,22 @@ cd rt-thread/bsp/qemu-vexpress-a9/

### 3.2 Configure the environment of Env tool

#### 3.2.1 Remap python command
#### 3.2.1 Provide the python command

We need to remap `python` command as python3 by default.

Using `whereis` command to identify your python3's version:

![python3-version](figures/python3-version.png)

For instance, as you can see, in my computer, the python3's version is python 3.9. You need to identify python3's version in your computer. Then, we remap the `python` command as python3 by default:
Some tools invoke `python` rather than `python3`. On distributions that
ship only `python3`, install the package that provides the `python`
command:

```shell
sudo rm -rf /usr/bin/python3
sudo rm -rf /usr/bin/python
sudo ln -s /usr/bin/python3.9 /usr/bin/python3
sudo ln -s /usr/bin/python3.9 /usr/bin/python
sudo apt install python-is-python3
```

> **Do not** remove `/usr/bin/python3` and re-create it by hand. On
> Debian and Ubuntu, `apt` and a large part of the system tooling are
> written in Python and resolve the interpreter through that path;
> deleting it leaves the machine unable to install packages, including
> the packages needed to put it back.

### 3.3 Install Env and Configure BSP

Type following the command under `bsp/qemu-vexpress-a9` folder:
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