Install Ubuntu and Redhat

[mthalis]

I first installed Ubuntu after that i install red hat but i use same swap that i used in Ubuntu,after install rad hat, Ubuntu can't see in my grub menu. so can i install both OS same machine? how i setup grub to work these two OS and windows.

[mthalis]

how to install Ubuntu,Red had and Windows in same machine or how configure grub.plz help........

[housam]

Read this document (http://ubuntuforums.org/showthread.php?t=724817)about maintaining more than 2 operating systems on your machine