I had exactly the same problem on my W540. I think it's an efibootmgr issue: https://github.com/vathpela/efibootmgr/issues/7
I "fixed" it from a live CD by manually downgrading the efibootmgr package to 0.5.4-7ubuntu1 (ie the one from 14.04 that was previously working) and rerunning "grub-install /dev/sda", "grub-install --recheck /dev/sda" and "update-grub" from a chroot. -- 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/ubuntu-release-upgrader/+bug/1387654/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
