Lenovo Z570
If you create a /boot/efi partition (Fat32) first Ubuntu 18.04 installs BUT
you cannot boot Windows 7 which is install legacy/bios boot. The only way I
could solve it was to delete all the partitions and reinstall Windows 7 in
UEFI boot mode. Then you can install 18.04 and boot either OS at startup.
Of course you have to keep all your data somewhere else. I got the computer
second hand so I didn't have any apps or data on it.

With best wishes,
Nigel Lumsden

+44 747 402 5466

On 19 May 2018 at 09:27, Keshav Parankusham <email address hidden>
wrote:

> I've tried boot-repair and many other solutions, but I was always
> getting an error that boot/efi directory was not found. Finally I tried
> disabling the UEFI mode and it worked like a charm. I don't know why
> I've never seen anyone mention to disable this, instead I just found
> more discription of how things work and tried to create partitions etc
> etc...
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1770991).
> https://bugs.launchpad.net/bugs/1767703
>
> Title:
>   Calling 'apt-install grub-efi-amd64-signed' failed
>
> Status in grub-installer package in Ubuntu:
>   Incomplete
>
> Bug description:
>   /plugininstall.py: Exception during installation:
>   /plugininstall.py: Traceback (most recent call last):
>   /plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line
> 1739, in <module>
>   /plugininstall.py:     install.run()
>   /plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line
> 61, in wrapper
>   /plugininstall.py:     func(self)
>   /plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line
> 227, in run
>   /plugininstall.py:     self.configure_bootloader()
>   /plugininstall.py:   File "/usr/share/ubiquity/plugininstall.py", line
> 971, in configure_bootloader
>   /plugininstall.py:     "GrubInstaller failed with code %d" % ret)
>   /plugininstall.py: ubiquity.install_misc.InstallStepError:
> GrubInstaller failed with code 1
>
>   ************************
>
>   +++++++++++++++++++++++++++++++++++++++++++++
>   MBR-EFI-GPT explanations/requirements:
>
>   https://askubuntu.com/questions/500359/efi-boot-partition-and-biosgrub-
> partition
>   https://askubuntu.com/questions/831216/how-can-i-
> reinstall-grub-to-the-efi-partition
>   https://askubuntu.com/questions/578928/why-i-need-
> several-boot-partitions-efi-and-bios-grub
>   +++++++++++++++++++++++++++++++++++++++++++++
>
>   Manual fix:
>   https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/
> 1766945/comments/3
>
>   also see: https://bugs.launchpad.net/ubuntu/+source/grub-
>   installer/+bug/1763441/comments/2
>
>   https://help.ubuntu.com/community/Boot-Repair
>
>   https://ubuntuforums.org/showthread.php?t=2390700
>
>   ************************
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 18.04
>   Package: ubiquity 18.04.14
>   ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
>   Uname: Linux 4.15.0-20-generic x86_64
>   ApportVersion: 2.20.9-0ubuntu7
>   Architecture: amd64
>   CasperVersion: 1.394
>   CurrentDesktop: ubuntu:GNOME
>   Date: Sat Apr 28 20:39:35 2018
>   InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed
> boot=casper only-ubiquity quiet splash ---
>   LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64
> (20180426)
>   ProcEnviron:
>    LANGUAGE=de_DE.UTF-8
>    PATH=(custom, no user)
>    XDG_RUNTIME_DIR=<set>
>    LANG=de_DE.UTF-8
>    LC_NUMERIC=C.UTF-8
>   SourcePackage: grub-installer
>   UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/grub-installer/
> +bug/1767703/+subscriptions
>