Install pyqt5 on ubuntu
You should do the following
$ sudo apt-get install -y python3-pyqt5 python-pyqt5
If you do not have pip3, execute the following to install it.
$ sudo apt-get install -y python3-pip
It doesn't seem to be the following command
$ sudo pip3 install pyqt5 ERROR: Could not find a version that satisfies the requirement pyqt5 (from versions: none) ERROR: No matching distribution found for pyqt5