I tried the web examples you show (only one per page) but everything works. I am with sagemath 8.1 beta8, I am not going to try all, but I think you have a problem with your sage installation, how did you get it ?
I am running xenial and I installed
sudo add-apt-repository ppa:chronitis/jupyter To get all widgets, there though a problem because sagemath installation is 7.5.1, but as I said I compiled sage-develop version regards Henri
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