'ns-3 installation in linux mint 20 error in installing python-pygraphviz,python-kiwi,python-pygoocanvas,libgoocanvas-dev

I am in trouble currently I am trying to install ns-3 network simulator in Linux mint 20 . My Laptop configuration is ASUS-Laptop-X407UA 64bit core i5 I am trying to follow these instructions https://www.nsnam.org/wiki/Installation#Ubuntu.2FDebian.2FMint

to follow this I have trouble in this phase

apt install python-pygraphviz python-kiwi python-pygoocanvas libgoocanvas-dev ipython
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ipython is not available but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Unable to locate package python-pygraphviz
E: Unable to locate package python-kiwi
E: Unable to locate package python-pygoocanvas
E: Unable to locate package libgoocanvas-dev
E: Package 'ipython' has no installation candidate


what can I do please suggest me something. Thanks in advance.



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