I have returned.
Due to some slightly stupid things I did (not in Leo!) I decided on a new
install of Ubuntu 18.04
Here is the installation script I am using for Leo
Install Python
sudo apt update
sudo apt install python3-pip
sudo apt-get install python3-pyqt5
# Combination of instructions
Ok, I finally encountered a bug: I am unable to save if a child @clean
node has (ordinary) children nodes:
Create a new file with an @clean foo.txt node, write @others into the body,
then create a child @clean goo.txt node and write something into it.
So far everything works as expected.