If you can boot Ubuntu the Live CD, choose "Try Ubuntu" option. Then try installing it again by choosing manual partitioning, It is the last option in the 'Prepare your disk' step. Reinstall it in the same partition you tried before.
If you can boot Ubuntu the Live CD, choose "Try Ubuntu" option. Then try installing it again by choosing manual partitioning, It is the last option in the 'Prepare your disk' step. Reinstall it in the same partition you tried before.