Is it possible to retain Windows & only remove Mint?
Sim
Can I just format the Linux partition from the Live CD and install Ubuntu into that partition?
Sim
Can I dual boot into either Windows or Ubuntu from a menu without any problem if I follow this procedure?
Eu não posso dizer sem nenhum problema ... mas deve funcionar
Could there be any problem while dual booting? Please advice.
Existe sempre a possibilidade de problemas, mas normalmente funciona apenas