I dont know how to reinstall Ubuntu, set up my partitions, or save my data (pictures, videos and documents). What should I do first? My system was set up by someone I no longer speak with.
If you are using a dual boot and wan to re-partition, you will want to back up all the files you want to save on a type of storage medium (e.g. USB or CD) After you have backed up your files, to edit your partitions, download GParted partition editor in Ubuntu software center and use it to edit your partitions. Just to be safe, make sure you have the disks for reinstalling the other OS on the computer. If you want to begin anew and make your computer entirely Ubuntu, just boot from the USB or CD with Ubuntu on it and install, this time not next to the other OS(s). Remember to back up all wanted files before taking any action.