I have many problems. First of all, I had dual booted Windows with Ubuntu 19.04, then I lost my Windows. I had checked partitions with GParted, but there is nothing related to Windows.

I had checked GRUB error also. I confirmed that I had lost my Windows. But there is another issue, total space of my hard disk is 1 TB, I gave Ubuntu with 10 GB space. And there is 910 GB unallocated space in the disk partitions. I don't know where is the remaining 90 GB space.

  • 10GB for Ubuntu is way too small. What harm would it do to allocate at least 100GB of the 1TB hard disk to Ubuntu? – karel Nov 27 '19 at 11:10
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    What exactly do you want? Recover windows? I am missing a question here. 10 GB for Ubuntu and 910 GB unallocated suggests indeed that one way or another your Windows partitions were wiped. You had a power cutoff on the wrong moment? In case of severe damage to the partitioning, you best start again from scratch, i.e., wipe the entire disk and reinstall everything. (Indeed 10 GB is too small for a root partition, make it at least 15 but better 20 or 25 if you plan to have /home on a separate partition) – vanadium Nov 27 '19 at 11:58
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  • Actually I use ubuntu only for programming. So I had given only 10GB of space. And the problem is I want to know whether i have my data that used to be in the windows before. I don't need to recover windows but i need the data. – Bhargav Bharu Nov 27 '19 at 12:38
  • @BhargavBharu Although their names might suggest otherwise, the linked partition recovery questions are actually mostly about recovering your important data. Recovering the Windows system itself is much less likely to succeed (but also unnecessary because, if you want to run Windows, you can simply reinstalling it after recovering your important data). – Eliah Kagan Nov 27 '19 at 19:54

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