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My laptop is Lenovo G50 with x64 processor. But I cannot install ubuntu 64bit(Tried 16.04, 18.04, 20.04) on this. Currently I Have ubuntu 18.04 32bit. But the 64bit iso installer gives error in grub installation step.

The Grub installation error is:

The 'grub-efi-amd64-signed' package failed to install into /target/. Without the GRUB boot loader, the installed system will not boot.

Installer crashed


We,re sorry the installer crashed. After you close this window, we'll allow you to file a bug report using the integrated bug reporting tool. This will gather information about your system and your installation process. The details will be sent to our bug tracker and a developer will attend to the problem as soon as possible.

I booted in UEFI mode.

Also i created EFI system partition.

My Partition table is MBR.

What i have to do?

If i boot in the legacy mode, will be this sovled?

I'm not dual booting with other OS.

I'm not sure i set EFI system partition as Primary(Maybe i set this as Logical). Is this related?

Is anyway to use other Bootloader? Is this problem Only related to Grub?

parsa mpsh
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  • If you're replacing the Ubuntu completely, Let the installer decide how to make partitions. It's very helpful to enable LVM partitioning, so you can easily change it later. – Danial Behzadi Jan 15 '21 at 19:49
  • Thanks Danial. Yes. but i dont't want to lose my hard disk data. I think I should use GPT partition table instead of MBR. But my problem is that this requires to fully delete current data. and backuping all of hard disk is hard. Is there any way to change partition table from MBR to GPT without deleting current data? – parsa mpsh Jan 16 '21 at 11:05
  • Check out this answer if you want to convert from MBR to GPT, it will usually work without dataloss, but best to have backups of data you don't want to lose under any circumstances. – mook765 Nov 25 '22 at 13:59

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