I need both 32 bit and 64 bit for
libncurses.so.5 on Ubuntu 20.04 (Focal Fossa) for building an Android application on an older Android NDK. What are my options?
libncurses.so.5 is not on apt-get anymore.
You have to update your package lists, as this package is still available from universe pocket.
Install them with:
sudo add-apt-repository universe sudo apt-get install libncurses5 libncurses5:i386