kernel dies when creating iruby notebook

Question

I am completely noob in SciRuby. For the first time I am using SciRuby. I am following this video to get an overview of how to use SciRuby and plot graphs, charts etc. When

Answer 1

This method helped me:
I had installed ruby kernel in jupyter notebook following SciRuby's GitHub page and it worked well that day. But after some days, I again ran it and the kernel started getting dead.
I don't know the exact reason behind this but I again followed the same method and it installed some extra gems and it worked!!
Follow this

sudo apt install libtool libffi-dev ruby ruby-dev make
sudo apt install libzmq3-dev libczmq-dev
gem install cztop iruby
iruby register --force

Run the notebook again

jupyter-notebook