Welcome to all new Ubuntu-eers!
If this is all you're doing and you want something light, you could get lighter and still stay in the officially supported Ubuntu family of flavours.
Why not give Xubuntu or Lubuntu a try in a Live session from the boot device ('Try *buntu' from the first options screen). If you really want to go light and for a steep learning curve, why not try
the minimal install, add a lightweight desktop environment (like xfce4 or lxde) and a package manager to install things (like Synaptic) and take it from there.
If you want to delve into this further and need more help, don't hesitate to post a thread in one of the support areas. Have fun.
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