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On 3 august I installed DiskGenius (and Ext2Fsd; I did not use it) to access to linux partition from windows and everything worked well.

Yesterday (5 august) I used Ubuntu 20.04 and after I turned off my laptop (on it there is the dual boot Windows 10 + Ubuntu 20.04). I turned on my PC, I selected the windows option from the boot loader GNU GRUB (as usual), then I used only firefox in Windows. Finally I turned off the PC.

Today, when I pushed the power button, the following message appeared:

Unexpected return from initial read: Volume Corrupt, buffersize 0
Failed to load image \EFI\ubuntu\grubx64.efi: Volume Corrupt
start_image() returned Volume Corrupt

and then the Windows 10 OS starts.

How could I fix this problem? I tried to unistall both Ext2Fsd and DiskGenius but the situation remained unchanged.

P.S.: yesterday linux downloaded and installed the last updates before I turned off it.

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    You should run Boot-Repair. If it does not solve your problem automatically, please edit your question to include the Boot-Info URL generated by Boot-Repair.
    – Melebius
    Aug 6 '20 at 11:02
  • Thank you very much @Melebius now it works! Aug 6 '20 at 13:20
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As you've already done, use boot-repair to recover from your corruption.

The Windows Ext2Fsd driver, used to read/write to Linux ext2/3/4 partitions, WILL corrupt partitions. Uninstall it asap.

If you wish to share files between Windows and Ubuntu, create a new NTFS disk partition to do so.

Let's check your file system for further corruption...

  • boot to a Ubuntu Live DVD/USB in “Try Ubuntu” mode
  • open a terminal window by pressing Ctrl+Alt+T
  • type sudo fdisk -l
  • identify the /dev/sdXX device name for your "Linux Filesystem"
  • type sudo fsck -f /dev/sdXX, replacing sdXX with the number you found earlier
  • repeat the fsck command if there were errors
  • type reboot

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