Ubuntu server 14.04.3 can be installed only with EFI partition but I can't boot

Petter Adsen petter at synth.no
Mon Oct 26 17:14:17 UTC 2015


On Mon, 26 Oct 2015 18:11:22 +0200
Sergiu Mihuleac <mihuleac.sergiu at gmail.com> wrote:

> How can the partition table be irrelevant? .. First of all, if you install

The partition table type is irrelevant because it simply doesn't matter
whether it is DOS or GPT in this scenario - that has nothing to do with
the OP's problem.

The OP has created the EFI boot partition inside the RAID, where the
UEFI firmware will not find it (because UEFI hasn't got support for
mdadm software RAID), so the system will not be able to boot. UEFI can
read both GPT and DOS partition tables, that is not the problem here.

> from usb the usb most be either dos or gpt, you can chose with rufus. If is
> gpt the installation will be gpt the same if it is dos.

No. If you install from _UEFI mode_, the installation will be UEFI mode
(and the same for CSM/BIOS mode), but you can boot and install from a
disk with GPT layout and create a DOS partition layout on the disk you
are installing to - you must be confusing the two.

> What firmware are
> you speeching about? Mdadm is software raid and also is a kernel module

By firmware I mean UEFI - it does not understand mdadm software RAID,
hence it will not be able to find the EFI boot partition if that is on
an mdadm RAID. If the partition table type had been DOS the UEFI
firmware would still not be able to find the EFI boot partition on a
Linux software RAID.

> that must be enabled and in ubuntu is enabled by default .. So the
> possibility of an incompatibility is low, i've used it on many   system
> including servers that had old hardware raid and a number of different
> pc's, never had any issues with it. The problem in your case is a misstep
> or a misconfiguration.

I'm not saying there is anything wrong with Linux software RAID, I'm
saying the EFI boot partition can not be part of it no matter what
partition table type are on the disks.

And please don't top post, it makes things unnecessarily hard to follow.

Petter

> On Oct 26, 2015 1:09 PM, "Petter Adsen" <petter at synth.no> wrote:
> 
> > On Mon, 26 Oct 2015 12:26:07 +0200
> > Sergiu Mihuleac <mihuleac.sergiu at gmail.com> wrote:
> >  
> > > On what hdd is grub installed? Make sure bios boots from it. Second for  
> > dos  
> > > you may need to recrete partition table, boot from an live usb with gpart
> > > and at device you will find create partition tabe then selec dos.  
> >
> > The partition table type is completely irrelevant. The problem is that
> > the firmware does not understand mdadm RAID. You can either place the
> > EFI boot partition on a non-RAID partition, put it on a USB stick and
> > boot from that, or manually duplicate a non-RAID EFI boot partition to
> > the other disk and add UEFI boot entries for it with 'efibootmgr'.
> >
> > Petter
> >  
> > > On Oct 26, 2015 12:16 PM, "Petter Adsen" <petter at synth.no> wrote:
> > >  
> > > > On Mon, 26 Oct 2015 12:02:54 +0200
> > > > Victor Sterpu <victor at casnt.ro> wrote:
> > > >  
> > > > > Hello
> > > > >
> > > > > I installed Ubuntu server 14.04.3 a lot of times today.
> > > > > My setup is 2 HDD in RAID 1, /boot, root and swap partitions.
> > > > > If I install Ubuntu without a EFI partition I receive the error "This
> > > > > GPT partition label contains no BIOS Boot Partition" when grub  
> > installs  
> > > > > and I can't boot.
> > > > >
> > > > > If I create a new partition of type EFI(RAID1) then grub install fine
> > > > > but I can't boot from the system.
> > > > > The Bios is in UEFI mode.
> > > > > How can I fix this?  
> > > >
> > > > Put the EFI boot partition outside the RAID?
> > > >
> > > > Petter
> > > >
> > > > --
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> >
> >
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-- 
"I'm ionized"
"Are you sure?"
"I'm positive."



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