CommentStreams:93e3653d4023e6cbff7954e742dca99e

I'm using latest version of Raspberry Pi Bullseye

   Release date: January 28th 2022
   Kernel version: 5.10
   Debian version: 11 (bullseye) 

When I get to this line in the above install process:

   sudo apt-get install -y python-smbus python3-smbus

It fails to install python-smbus. I changed the command to

   sudo apt-get install -y python3-smbus

And continued the install without it. When the install was complete the fan seems to run OK and xoff and the power work.