Thanks for your reply. I had already disabled Fastboot in Windows.
I ran `chkdsk /f /r` from Windows on the EFI partition and then tried installing Ubuntu. The installation succeeded but I was not able to boot into Ubuntu. I used bcdedit to add grubx64.efi to the boot path but even that did not help. To make matters worse, when I tried reinstalling Ubuntu, I started getting the same error again - "grub-install failed...this is a fatal error". Unfortunately this time, even `chkdsk` from Windows failed to resolve the issue. So I used `Try Ubuntu` option from the live usb stick and ran the commands you suggested for my EFI partition: sudo fsck /dev/nvme0n1p1 sudo badblocks /dev/nvme0n1p1 -v There were no errors reported. I have spent over a day now on this and am really not sure what is wrong here. I would really appreciate some help/insight. Let me know if any more info is required. Thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1839894 Title: Installing Ubuntu 18.04.3 LTS alongside Windows 10 (Dual Boot) causes grub install to fail with fatal error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1839894/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
