First of all: make a full back-up of both systems before continuing!
Just insert the SD-card into the SD-card reader of your laptop, download Lubuntu 32-bit if less then 1GB of RAM or an old processor or 64 bit if less then 2GB of RAM or Xubuntu 64-bit if less then 4GB of RAM or the 64-bit plain vanilla Ubuntu if your netbook has 4GB of RAM.
Then find out from
gparted what disk the SD-card on your laptop is. (
sdc on mine, but yours might differ)
Then just go to a terminal by pressing Ctrl+Alt+T and use the following command to copy the iso file to the SD card:
sudo dd bs=4M if=/home/YourUser/Downloads/NameOfIso.iso of=/dev/XdY
YourUser is the name of your user name,
NameOfIso is the name of the iso file you decided to download,
Y are the letters of your SD-Card. (You should have downloaded to iso to the
Downloads folder! :P)
dd is the abbreviation of Disk Destroyer! Ensure twice that the command above is correct before pressing Enter!
When you get your prompt back, type
sync and wait some more. Then shut down the laptop (no hibernate nor suspend) and only then remove the SD Card! (I only remember "newbie" and forget all about "semi" ;-) )
Now insert the SD-card in the netbook, turn it on and boot from the SD-card and follow the official installation instructions for the Ubuntu version you decided to install...