Descrição:
#########
# Fonte #
#########
# https://www.fosslinux.com/39384/switching-between-python-2-and-3-versions-on-ubuntu-20-04.htm
# https://linuxize.com/post/how-to-install-pip-on-ubuntu-20.04/
# https://pt.stackoverflow.com/questions/240298/erro-ao-instalar-pyaudio-e-pocketsphinx
################
# Configuração #
################
sudo apt install python2
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 1
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 2
curl https://bootstrap.pypa.io/get-pip.py --output get-pip.py
sudo python2 get-pip.py
#Exemplo
sudo pip install aiml
Abraço ;)