Thank you for taking the time to report this issue and helping to make Ubuntu better. I looked through UbiquityDebug.txt and found the following line in the part where grup-installer tries to run: Jun 16 15:12:24 ubuntu kernel: [ 474.812397] FAT-fs (sda2): error, fat_get_cluster: invalid cluster chain (i_pos 0)
Your EFI filesystem (sda2) where grub should be may be corrupt according to some earlier log entries: Jun 16 15:06:10 ubuntu ntfsresize: Filesystem check failed! Totally 16 cluster accounting mismatches. Jun 16 15:06:10 ubuntu ntfsresize: ERROR: NTFS is inconsistent. Run chkdsk /f on Windows then reboot it TWICE! Jun 16 15:06:10 ubuntu ntfsresize: The usage of the /f parameter is very IMPORTANT! No modification was Jun 16 15:06:10 ubuntu ntfsresize: and will be made to NTFS by this software until it gets repaired. If you have the ability to boot Windows you could try the above instructions, if not you can also fix it with Ubuntu. Boot into a Live CD and run: sudo apt-get install ntfs-3g sudo ntfsfix <partition to fix, probably /dev/sda2> You could also try to completely repartition the disk. Remeber that doing these operations is not risk-free and take care to back up any data that you have one the hard drive. ** Changed in: grub-installer (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1191536 Title: efi Error grub-installer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1191536/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs