I just reproduced the issue (thanks for reporting it). Currently, we've two related issues.
First, to solve the issue related to this error we should install Python QTI Migration Tool because we are not installing it by default.
We can install it running:
sudo apt install -y git
sudo git clone https://github.com/instructure/QTIMigrationTool.git QTIMigrationTool
sudo chmod +x QTIMigrationTool/migrate.py
sudo chown -R root:daemon QTIMigrationTool/
sudo script/delayed_job restart
Once installed, we can import the content, but at this step, we just discovered another issue related to the jobs. We can launch the jobs to import the content but the jobs are not running correctly so they are frozen.
I just created two internal tasks, one for install Python QTI Migration Tool by default and the other one to fix the jobs issue.
We are going to work on fixing it and we will let you know when we have any news about it.
Thank you for reporting it.
Carlos R. Hernández