Video Driver Incompatability
I am new to Linux and have tried several Ubuntu 14.04 versions. For about 3 weeks I loaded version after version on my laptop and I finally chose Kubuntu and like it, but why does the Ubuntu Desktop video driver work so agonizingly slow compared to all the others I tried. I have an older IBM Laptop that runs a Radeon Mobility 7500 video card. Lubuntu, Kubuntu, Xubuntu, Mint, Gnome and Peppermint all ran faster and all use the same Ubuntu 14.04 as the basic engine and just run different GUI's, if I understand it right. Of course, the one I wanted to use was Ubuntu Desktop and it just did not like my computer. I guess my question is, why do all Ubuntu 14.04 versions not use the same video drivers? I really wanted the only one my computer did not get along with.