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I have a Dell Inspiron 15 7000 and I installed Ubuntu in /dev/sda. Sadly once the operation is completed if I try to use boot-repair it says EFI partition is not found.

I'm pretty sure I have to install as I did, in legacy..because I own a UEFI system but apparently a legacy Windows 10. Still in my BIOS I can't retrace Windows boot manager, I tried with bootmngr.efi but to the system it looks like there is no boot device avilable. By now it boots as partition 1. Disk 1 is where Windows OS is installed, I instead installed Ubuntu on disk 0. Can someone tell me if this is the actual problem? I decided to install on disk 0 because there's much more space in there. If i type sudo parted -l the result is

Model: ATA ST1000LM035-1RK1 (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Disk Flags:

Number Start End Size File system Name Flags 1 1049kB 135MB 134MB Microsoft reserved partition msftres 2 135MB 1000GB 1000GB ntfs Basic data partition msftdata

Model: SCSI DISK (scsi) Disk /dev/sdb: 16.0GB Sector size (logical/physical): 512B/512B Partition Table: msdos Disk Flags:

Number Start End Size Type File system Flags 1 1049kB 16.0GB 16.0GB primary fat32 boot, lba

But if i try to install ubuntu in uefi mode a windows pops up stating This machine's firmware has started the installer in UEFI mode but it looks like there may be existing operating systems already installed using "BIOS compatibility mode". If you continue to install Debian in UEFI mode, it might be difficult to reboot the machine into any BIOS-mode operating systems later. This is weird considering that according to the system settings the bios is UEFI.

Mario Bernardi
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  • If you system was purchased from Dell with Windows 10 (or 8) then it has to be UEFI. post this in your question above: sudo parted -l – oldfred Jan 12 '18 at 15:37
  • should i select a gpt partition for uefi computer? – Mario Bernardi Jan 12 '18 at 16:36
  • You have gpt on sda & MBR(msdos) on sdb. Better if all drives are gpt if you want UEFI. But sda only has the required Windows msftres/Microsoft reserved partition. Did you erase Windows? If also re-installing Windows do that first as it wants several partitions. http://askubuntu.com/questions/743095/how-to-prepare-a-disk-on-an-efi-based-pc-for-ubuntu & https://askubuntu.com/questions/343268/how-to-use-manual-partitioning-during-installation – oldfred Jan 12 '18 at 17:51
  • well..no i'm using Windows right now!! I know perfectly how the partition works..but i don't get why i get errors installing uefi, and installing Legacy i couldn't access ubuntu. – Mario Bernardi Jan 12 '18 at 17:59
  • The reason why you see just a partition i think/hope is due just to the fact that i shrinked that volume. I tried to use Rufus to have gpt in dev/sdb but keep getting the same error – Mario Bernardi Jan 12 '18 at 18:58
  • Lets see all the details: May be best to see details, you can run from your Ubuntu live installer or any working install, use ppa version not older Boot-Repair ISO: Post the link to the Create BootInfo summary report. Is part of Boot-Repair: https://help.ubuntu.com/community/Boot-Info and: https://sourceforge.net/p/boot-repair/home/Home/ – oldfred Jan 12 '18 at 22:10
  • https://paste.ubuntu.com/26380372/ this is what I get after installing linux as legacy. Sadly i think i have windows in UEFI but if I try installing in UEFI it tells me I am forcing the installation as reported in the originary question – Mario Bernardi Jan 13 '18 at 20:33
  • You are not showing Windows? Nor an ESP - efi system partition. And Ubuntu is in BIOS boot mode on gpt drive.Do you have another drive with Windows that is not plugged in? If so, plug it in & rerun report. If not, is Windows still boot? You also have many, many UEFI entries, and they look like duplicates. There used to be issues with too many entries. See efibootmgr -b examples in man efibootmgr & https://ubuntuforums.org/showthread.php?t=2289179&p=13331743#post13331743 – oldfred Jan 13 '18 at 21:19
  • Yes I installed Ubuntu in bios mode because otherwise he gave me the error. I didn't unplug anything. All I know is that i have installed ubuntu in disk0..where i had enough space, and windows is installed in disk 1 – Mario Bernardi Jan 13 '18 at 22:52
  • i just used efibootmgr to delete duplicates, thanks a lot! – Mario Bernardi Jan 14 '18 at 11:54
  • Is Windows drive plugged in? Report only showed one drive. And drive order is an issue as grub only installs to ESP - efi system partition on drive seen as sda. Installer may not be complaining, since you have BIOS boot grub installed. You can use Boot-Repair's advanced mode to convert current install to UEFI by uninstalling grub-pc and installing grub-efi-amd64. You must boot live installer in UEFI mode & then add Boot-Repair, so in UEFI mode. – oldfred Jan 14 '18 at 14:43
  • I'm using Windows to answer, so yes it is plugged in. I don't know why it doesn't show up!! I just uninstalled ubuntu..you think i should install it in legacy mode and than try to convert? – Mario Bernardi Jan 14 '18 at 14:49

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