I Used 16GB Memory Card to Install Ubuntu, and it Uses around 1GB, so i think Lubuntu is more LightWight, You Can use an SDcard from your Smartphone but Becarful everything will be Wiped, it's not a good idea i dont recommend it at all,
I Used 16GB Memory Card to Install Ubuntu, and it Uses around 1GB, so i think Lubuntu is more LightWight, You Can use an SDcard from your Smartphone but Becarful everything will be Wiped, it's not a good idea i dont recommend it at all,