I install Ubuntu on my laptop.the installation is successful but the problem is.already I install windows 7 at the time OS installation I choose another volume instead of win7 volume so my windows 7 is still present in my system is there any way to get back it
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If windows is present, you should be able to select at startup during the grub.
You don't precise which version you are working with so I add this comment :
I noticed with ubuntu 14.04 (maybe 15.04 too), grub may not appear. If grub not appear edit file "/etc/default/grub" and comment "GRUB_HIDDEN_TIMEOUT=0".
You should now have something like this :
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=""
Then update grub :
sudo update-grub2
Finally restart your computer and you should be able to select another system.

Inglebard
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i use 14.04 . i use update command that shows win8 on bootselection.if i select that option nothing will happen – sweet susee Aug 29 '15 at 12:17
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Also chek this subject, it talks about dual boot with ubuntu and window 8 and seems very complete, check dualboot issues and troubleshooting : http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-with-uefi – Inglebard Aug 29 '15 at 12:26
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my os is windows 7 but i use win8 along inside cd.suppose that is cause this problem – sweet susee Aug 29 '15 at 12:40
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sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update sudo apt-get install boot-repair boot-repair – sweet susee Aug 31 '15 at 04:05
sudo update-grub
in the terminal should make it show up in the Ubuntu boot menu. – TheWanderer Aug 29 '15 at 12:04sudo parted -l
terminal command. – Pilot6 Sep 03 '15 at 08:57