What are some similarities and differences between the Chinese concept of Dao in Daoism (https://en.wikipedia.org/wiki/Tao) versus the South African concept of Ubuntu (https://en.wikipedia.org/wiki/Ubuntu_(philosophy))?
If I understand the question correctly I believe you are referring to the totality of Dao within Daoism. @virmaior is correct that Tao/Dao is used in other Chinese philosophies as well but we shall limit this discussion to only Taoism (see Confucianism ethical Dao)
Dao is something unexplainable/beyond comprehension (words can not adequately describe the totality of Dao) but it is within everything and is the fundamental energy all things share. The Inner Chapters are an excellent starting point to understanding Daoist Dao.
I believe that Ubuntu is generally more like the Confucius concept of Dao. The idea of ethical/moral treatment of others to be a key to humanity is more concerned with the acts of individuals and not the all encompassing energy of Daoist Dao. (from my small understanding of Ubuntu, so if someone knows more please comment and correct me)