I tried to dual boot Ubuntu with Windows 7 and it turned out that I booted only Ubuntu. All my data in windows 7 OS are gone. Is there any chance I can retrive those data? And I want to dual boot windows 7 now. How do I do it? If I do it will it be enough for me to get the datas back?
first try to get your data back, try if you can recover your lost partition with testdisk you can install it just by typing in the terminal
sudo apt-get install testdisk
it doesn't have a graphical interface so run in terminal by typing
and choose the appropriate hard drive and tell us the results
Well .. the most popular (and safest) way is boot-repair
sudo add-apt-repository ppa:yannubuntu/boot-repair sudo apt-get update sudo apt-get install -y boot-repair && boot-repair
and follow recommended repair. But there are some chances that it won't work. If that's the case, try using os-prober directly. Os-prober is the tool that does the job of detecting OSes (including windows). Most probably it will already be installed. If not,
sudo apt-get install os-prober
Now for next step, you need to know if your partition table is MBR or GPT. If MBR,
sudo grub-mkconfig -o /boot/grub/grub.cfg
sudo grub-mkconfig -o /boot/efi/EFI/GRUB/grub.cfg
If you can't figure out whether your partition table is MBR or GPT style, look for /boot/efi/EFI directory. If it is available, most probably it is GPT.