Need help installing Ubuntu alongside Elementary OS
If Elementary OS is still there, you didn't erase it. If you want to erase the drive and do so for sure (without reinstalling anything), load up into your Ubuntu drive or a LiveUSB and open (may need to install) Gparted. Locate the drive with Elementary OS on it and then eradicate it from existence with the "delete" options (make sure the drive you don't want erased is disconnected just in case). And then you can install on it or do as you please.
Guide:
http://askubuntu.com/questions/342857/how-to-wipe-format-entire-disk-using-gparted
Next time, if you wish to dual boot, install Ubuntu first and then pop in the install disc for the other distro and select the second drive that you wish to install on. Install as normal (do not pick "alongside" if your intent is to install on individual drives) and then reboot. If you do not see a selection screen, boot into whichever distro it allows you to and then install boot-repair and then run the recommended option. It will adjust and fix your grub so that you have a selection screen. You may, at this point, have to change the BIOS boot order but that's about it.

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