Background info: I already have a UEFI based windows 8.1 instance installed in C drive(/dev/sda1), so I am trying for a dual boot installation, which works fine with Ubuntu 15.10 live instance.
As 16.04 installation failed, I removed the USB drive and restarted, then I got the screen as seen in Image1.jpg, attached with this. Then I tried to boot into 16.04 live USB, it gave me a kernel panic which you can see in Image2.jpg, attached with this. I tried installing Ubuntu 15.10 again, it completed successfully, and Grub also installed successfully. I then checked md5 hash of 16.04 image, it was ok, so the 16.04 image is fine. I tried installing 16.04 again using another bootable USB image that I created from the iso image, to be sure that the issue is not with the USB drive. This time also the installation failed with same error. After this error if I restart and try to boot from the live USB, it fails with a kernel panic. This was same, during the both times I tried, so I had to use 15.10 bootable USB, which started up normally without and kernel panic, I tried installing Boot fixer in the live instance, and fix grub, I followed the steps, as I understand it could not fix GRUB in EFI mode, so it went for non-EFI installation, which succeeded, but this failed to detect and list the Windows 8.1 UEFI based installation that I already have. So, this fix also failed, so I again booted into 15.10 live instance and installed it again, after formatting the current non-working 16.04 instance, it completed successfully, I did a restart, GRUB was showing all entries for Ubuntu and also for the Windows 8.1 too I tried booting to Windows 8.1, that also worked fine. I booted back to Ubuntu 15.10, updated repository indexes, was shown option to upgrade, upgraded to Ubuntu 16.04 from there, this is how I got into 16.04, with a working GRUB instllation. Looks like there is some regression issue with GRUB installation stage of the Ubiquity installer, in case of a dual boot EFI based scenario. ** Attachment added: "After 16.04 install fail, 16.04 live USB drive removed" https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1573409/+attachment/4644575/+files/Image1.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573409 Title: Grub install fails at end of Ubuntu 16.04 installation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1573409/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
