wubi引导ubuntu能进livecd，引导fedora22也行

打开X:\ubuntu\install\boot\grub
用记事本打开grub.cfg
在grub.cfg下面加入
menuentry "Demo mode" {
linux /ubuntu/install/boot/vmlinuz.efi iso-scan/filename=/ubuntu/install/installation.iso quiet splash boot=casper ro debian-installer/locale=zh_CN.UTF-8 keyboard-configuration/layoutcode=us keyboard-configuration/variantcode= -- rootflags=sync
initrd /ubuntu/install/boot/initrd.lz
}

menuentry "Fedora Live 22" {
set root='hd0,msdos5' #iso所在分区，fat32 。ntfs分区有可能会引导失败。
set isofile='/Fedora-Live-Workstation-x86_64-22-3.iso'
loopback loop $isofile
linux (loop)/isolinux/vmlinuz0 iso-scan/filename=$isofile root=live:CDLABEL=Fedora-Live-WS-x86_64-22-3 rootfstype=auto ro rd.live.image quiet rhgb rd.luks=0 rd.md=0 rd.dm=0 nomodeset
initrd (loop)/isolinux/initrd0.img
}

注销
# TBD try to boot directly from kernel/initrd within the ISO via the grub2 loop module

#search -s -f -n /ubuntu/install/boot/vmlinuz.efi
保存。

重启电脑，选择Ubuntu 按Enter
5秒内按Esc键，弹出菜单
选择Fedora Live 22