Install Stata16 on Ubuntu 20.04
First one is easily resolved by installing libncurses for 64 bit system appropriate one is:
sudo apt-get install libncurses5
Second issue is solved by adding appropriate ppa fixing installation issues of older deb packages originating in changes in directory structure.
add-apt-repository ppa:linuxuprising/libpng12
sudo apt install libpng12-0
Finally a noncricial error of missing libcanberra can be resolved via
sudo apt install libcanberra-gtk-module libcanberra-gtk3-module
Hopefully this will save someones time in the future.