boot windows but not ubuntu

I have easybcd 2.3 on Windows 10 laptop (IDE) with an extra disk on cd place. In this extra disk I have already installed windows xp and Ubuntu. When starting from this extra disk in its main disk place there is no problem, both OSs booting very well. When starting from Windows 10 with easybcd, the windows xp boots normally but Ubuntu comes only to Grub command. I tried everything but without success, Ubuntu wont boot!
Grateful for any help!