Kanda Kumar V wrote: > I've tried installing the boot loader (the grub) into /dev/sda (my > external drive) and when i reboot after the installation finishes.. i'm > getting grub error 17. i can't boot from my external USB device... i've > set my boot priority in BIOS as 1. USB hdd <a href="http://2.cd/" target="_blank">2.CD</a> drive 3.internal disk(the > windows one)... > > my external drive is an Western digital USB external HDD. Grub error 17 is "can't mount partition" (please post the error messages, we shouldn't have to go looking) Which makes one wonder if you really have grub pointing at the right device/partition. Regardless of whether /dev/sda really is the USB drive, there are a couple of other options. 1) You probably can't boot from a USB device if usbstorage, and probably other modules aren't in the initrd image in /boot. I can't begin to imagine how you make sure the right modules are there. 2) You might try installing grub to the USB drive's partition superblock, rather than the MBR, and chaining from the internal drive's grub. The entry in the internal drive's boot menu.lst would look like: title USB Boot root (hd1,0) makeactive chainloader +1 Hi Derek, Sorry for not mentioning the error message. I tried installing again and yes it is /dev/sda is the usb drive. And as told you i installed grub in USB drive's partition superblock and it worked for me... Thanks a lot... i've been trying this for 5-6 time... as i'm very new to linux installation... that's why... Thanks all for your support... i'm really very happy that i got to install ubuntu in my laptop.. -- Thanks and Regards, V.Kanda Kumar