Python3 version alternatives and virtual environments

Solving multiple python installation:

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2

sudo update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.10 3
 

sudo update-alternatives --config python3

Solving:

Error: Command '['/home/DRIVE/Temp/aa/bin/python3.9', '-Im', 'ensurepip', '--upg
rade', '--default-pip']' returned non-zero exit status 1.
 

apt-get install python3.6-dev python3.6-venv

python3.6 -m venv myVenv 

Upgrade pip

pip3 install --upgrade pip