Thanks @addam-edgley et al! I was thrashing on this for most of last night but figured it out in the morning.
I had a slightly different experience (mainly encrypted root with LVM), so recording it in full for The People Of The Future™. This is very similar to Adam's post and the answer at http://superuser.com/questions/376470/how-to-reinstall-grub2-efi - Boot live CD and open terminal. - Connect to wifi and ensure that your resolv.conf has a good nameserver (e.g. you can `dig google.com`). - $ sudo su - - Use gdisk (or fdisk) to check which disk is your HDD. Mine was /dev/sda - # cryptsetup open /dev/sda3 myroot ## You will need the passphrase for this. - # lvdisplay ## Find the path of your root volume. Mine was /dev/ubuntu-vg/root - # mount /dev/ubuntu-vg/root /mnt - # mount /dev/sda2 /mnt/boot ## Required for doing update-grub later. - # mkdir /mnt/boot/efi ; mount /dev/sda1 /mnt/boot/efi - # for i in /dev /dev/pts /proc /sys; do sudo mount -B $i /mnt$i; done - # cp /etc/resolv.conf /mnt/etc/ ## Makes the network available after chrooting. - # modprobe efivars - #chroot /mnt - Add "deb http://au.archive.ubuntu.com/ubuntu/ trusty main restricted" to /etc/apt/sources.list - # apt-get update - # apt-get install efibootmgr=0.5.4-7ubuntu1 - # update-grub - # ls /boot/efi/EFI/ubuntu ## Find the efi files that you might need. Mine was shimx64.efi & grubx64.efi - # efibootmgr -c --disk /dev/sda --part 1 --loader '\EFI\ubuntu\shimx64.efi' --label 'Linux shim' ## Where ' --part 1' is your EFI partition number on '--disk /dev/sda'. - # efibootmgr -c --disk /dev/sda --part 1 --loader '\EFI\ubuntu\grubx64.efi' --label 'Linux grub' - # efibootmgr -v ## Verify the new records. - Ctrl+D to leave the chroot. - # umount /dev/sda1 # dismount EFI volume - # umount /dev/sda2 # dismount boot volume - # reboot Thanks again everyone - you saved my weekend. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1387654 Title: installing or upgrading to Ubuntu 14.10 kills Boot Manager on ThinkPad W540 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/efibootmgr/+bug/1387654/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
