So I was using Windows 10 for almost 3 years. Recently I installed ubuntu using USB bootable device and I selected the option:

Install ubuntu alongside windows 10

It worked like a charm(ONLY FOR 2 DAYS). At the beginning I was able to select which OS i want to use and both windows as well as ubuntu were fine.

Today when I tried to use windows 10 it suddenly showed the error:

enter image description here

A run of the fdisk command gives the output:

Device          Start        End   Sectors   Size Type
/dev/sda1        2048     534527    532480   260M EFI System
/dev/sda2      534528     796671    262144   128M Microsoft reserved
/dev/sda3      796672  482149397 481352726 229.5G Microsoft basic data
/dev/sda4   763428864 1316388863 552960000 263.7G Microsoft basic data
/dev/sda5  1316388864 1910306815 593917952 283.2G Microsoft basic data
/dev/sda6  1910308864 1911805951   1497088   731M Windows recovery environment
/dev/sda7  1911805952 1953517567  41711616  19.9G Windows recovery environment
/dev/sda8   482150400  763428863 281278464 134.1G Linux filesystem

Partition table entries are not in disk order.

Even if I try to mount /dev/sda3 nothing happens.

My main problem is I have windows 10 and some important data stored on /dev/sda3, but when I try to open it on ubuntu, nothing happens, all other partitions are working fine and Im also able to access their data.

Im a complete noobie to unix/linux systems and have no understanding how the file system works here, any hint as to how to deal with such problem, also is there any chance that I can get my data back on /dev/sda3.

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