Triple boot. But a little special..(?)...

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http://www.backtrack-linux.org – Hello, First I'd like to say that I've done a lot of search before asking this question. And even if I found some infomations, my question remains. So here is the situation A disk with Win7 and Ubuntu in dual boot, but not with grub2. I kept the windows mbr and added grub to a /boot partition, then added an entry in windows mbr with bcd So /dev/sda1 ntfs SYS /dev/sda2 ntfs WIN /dev/sda3 EXTENDED /dev/sda5 ext4 /boot -----> installed the ubuntu mbr here /dev/sda6 ext4 / /dev/sda7 ext4 /swap (HowTos)