Thread: GRUB only boots Windows, not Kubuntu

i’m having problem setting computer dual-boot windows vista , kubuntu. have windows , windows bootloader installed on 500 gb sata drive (sda) , kubuntu , grub on 60 gb pata drive (sdb). no matter hard drive boot from, boots windows. tried chrooting kubuntu system on sdb livecd , changing following lines in /etc/default/grub to:

code:

grub_hidden_timeout=10 grub_hidden_timeout_quiet=false

when ran update-grub, identified kubuntu system on sdb , windows system on sda, still booted windows either drive.

tried chrooting kubuntu, purging grub, , reinstalling on sda on windows bootloader. that, however, made neither os bootable--it says "device not found:" followed sdb's uuid , dumps me @ grub rescue prompt. when run ls @ prompt, lists windows hard drive , partition. restored windows bootloader on sda , reinstalled grub on sdb, , it's doing same thing before--booting windows no matter what. how can fix can boot sda windows , boot sdb kubuntu?


system configuration (this homebuilt computer):

sda 500 gb sata drive plugged sata 1 , designated bios 3rd master.
sdb 60 gb pata drive plugged pata port , designated bios 2rd master.
cd/dvd drive plugged sata 3 , designated bios 3rd slave.


output of fdisk -l (from livecd):

code:

disk /dev/sda: 500.1 gb, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors units = sectors of 1 * 512 = 512 bytes sector size (logical/physical): 512 bytes / 512 bytes i/o size (minimum/optimal): 512 bytes / 512 bytes disk identifier: 0x5be96505     device boot      start         end      blocks   id  system /dev/sda1   *        2048   976771071   488384512    7  hpfs/ntfs/exfat  disk /dev/sdb: 60.0 gb, 60000000000 bytes 255 heads, 63 sectors/track, 7294 cylinders, total 117187500 sectors units = sectors of 1 * 512 = 512 bytes sector size (logical/physical): 512 bytes / 512 bytes i/o size (minimum/optimal): 512 bytes / 512 bytes disk identifier: 0x0008da8e     device boot      start         end      blocks   id  system /dev/sdb1   *        2048   109180927    54589440   83  linux /dev/sdb2       109182974   117184511     4000769    5  extended /dev/sdb5       109182976   117184511     4000768   82  linux swap / solaris

my /etc/default/grub file:

code:

# if change file, run 'update-grub' afterwards update # /boot/grub/grub.cfg. # full documentation of options in file, see: #   info -f grub -n 'simple configuration'  grub_default=0 grub_hidden_timeout=0 grub_hidden_timeout_quiet=true grub_timeout=10 grub_distributor=`lsb_release -i -s 2> /dev/null || echo debian` grub_cmdline_linux_default="quiet splash" grub_cmdline_linux=""  # uncomment enable badram filtering, modify suit needs # works linux (no patch required) , kernel obtains # memory map information grub (gnu mach, kernel of freebsd ...) #grub_badram="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"  # uncomment disable graphical terminal (grub-pc only) #grub_terminal=console  # resolution used on graphical terminal # note can use modes graphic card supports via vbe # can see them in real grub command `vbeinfo' #grub_gfxmode=640x480  # uncomment if don't want grub pass "root=uuid=xxx" parameter linux #grub_disable_linux_uuid=true  # uncomment disable generation of recovery mode menu entries #grub_disable_recovery="true"  # uncomment beep @ grub start #grub_init_tune="480 440 1"

any appreciated.

if ls can't see small disk doesn't can recognize @ least boot purposes. sure allows boot sdb?

problem seems it's not recognized boot keeps booting sda. board sata , ide i'm not sure if give priority sata disks boot although should allowed select want boot from.

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