I’d like to install Ubuntu on one of the partitions and everything is working fine. Jump to content. Having trouble dual booting Ubuntu 18.04 and Windows 10. Edit: I think clearing existing Ubuntu boot via efibootmgr is important. And depending on a modifed BIOS boot order, you may have to set Win boot in first position as I had to do. I usually work on a Mac. But I would assume that the regular dual boot install for Ubuntu would work just fine. See the official Ubuntu Dual-boot guide. Will uBuntu Grub 2 still handle the boot process? Apr 26, 2016 - 3:09 AM - hans - Author: Comment Link.
Can anyone help me restore the original boot 'order' on my Mac, using command-line? I wanted to install Ubuntu on my Macbook Pro Retina (early 2013), so I could run some specific software I needed for my work. I followed the instructions from this site: I managed to install Ubuntu on a small partition on my HD, and then I performed 'efiboot fix', as suggested, so I could boot Ubuntu after restarting my Mac. I ran the following commands in Ubuntu: sudo apt-get install efibootmgr sudo efibootmgr sudo efibootmgr -o 0,80 Then I restarted my Mac, but neither Ubuntu nor OS X could boot normally. Basically, I got a blank screen. I restarted again, holding the alt key, and then I was able to choose to boot OS X. Can I revert the boot order somehow, using Terminal commands in OS X?
Really don't feel like experimenting again with Ubuntu. And can I remove this disk partition with Ubuntu now? I tried to do it through Disk Utility, but it's not possible. Any help will be greatly appreciated.
Contents. Introduction IMPORTANT: This page is a bit outdated.
A newer and simpler documentation about UEFI is available here:. Is the firmware that will eventually replace BIOS in commercial PCs. PCs certified for Windows 8 will require UEFI booting by default. Many vendors have started adopting UEFI as their firmware. Some of the notable UEFI firmwares are Phoenix Secure Core Tiano, AMI Aptio, and Insyde H2O.
Caution if you want to dual boot. Due to bug the boot partition will be formatted. This has resulted in the Windows bootloader being deleted for some users of Ubuntu 11.04 & 11.10. This issue has been resolved in Ubuntu 12.04.
To be safe, even on non-Mac machines, you can boot the, where the UEFI bootloader has been removed. You can install Linux in BIOS mode, and then set up e grub2 EFI. Non-Mac UEFI systems Linux officially supports both the UEFI and BIOS firmware. However Windows supports UEFI only with Vista for x8664, SP1 and later (on UEFI 1.1), or Windows 7 (on UEFI 2.0), or Windows 8 (on UEFI 1.1), and only with GPT partitioning.
Apple Mac EFI systems Apple officially supports only EFI booting for Mac OS X, although technically it is possible to boot Mac OS X using BIOS firmware. Booting Linux using (U)EFI on Intel Macs has the following advantages:. For dual-graphic card models, the power-saving card can be used (Nvidia 9400M, Intel GMA HD (aka 5700MHD), Intel GMA HD 3000, or Intel GMA HD 4000), resulting in significantly longer battery life and lower temperatures. Only for Intel graphics, the same is achievable in BIOS mode with the 'setpci' command described below. Faster bootloading, because the legacy BIOS does not need to be loaded, and it does not need to search for BIOS bootable disks.
SATA disks are accessed in AHCI mode instead of legacy IDE mode, allowing advanced features (native command queuing, aggressive link power management, and more). On Xserve models, there is no legacy BIOS layer, a.k.a. Use of hard disks larger than 2 TiB (2.2 TB) with GPT partitioning instead of MBR partitions. However it also has the following drawbacks:. EFI booting is still experimental and not yet supported as a mainstream boot method on Macs, since Apple uses a nonstandard mix of EFI 1.x with some UEFI 2.x functionalities (x8664, GOP, etc.). Models with Thunderbolt connectors only support external monitors with the discrete graphic card, not with the Intel integrated graphic card (the same limitation is also applicable on MacOS X).
Some hardware features might not work reliably: screen brightness control, suspend/resume, etc. Virtual terminals (Ctrl-Alt-function key) might not work with some graphic drivers (they stay black). OS kernel architecture (32 or 64-bit) must be the same as the EFI architecture (unless 'eficross' is used, which is available from kernel 3.4) Caution for Mac owners In Ubuntu 11.04 (x8664 only), due to bug, the ISO CD supports UEFI booting and the Ubuntu installer will try to set up the bootloader for (U)EFI boot. But the installer formats the EFI System Partition to FAT16 (even if the filesystem is non-empty) and also uses efibootmgr, therefore Intel Macs may fail to boot due to corrupted firmware.
This feature is not recommended on Mac models because it can corrupt the firmware. You will need to reflash the firmware to repair it. The bug was fixed in Ubuntu 11.10.
On Macs use only the Setting up GRUB2 (U)EFI Detect (U)EFI firmware processor architecture If you have a non-Mac UEFI system, then you have a x8664 (aka 64-bit) UEFI 2.x firmware. Some of the known x8664 UEFI 2.x firmwares are Phoenix Secure Core Tiano, AMI Aptio, Insyde H2O. Some of the known systems using these firmwares are Asus EZ Mode BIOS (in Sandy Bridge P67 and H67 motherboards), MSI ClickBIOS, HP Elite Books, Sony Vaio Z series, Lenovo Think Pads (=2010), many Intel Server and Desktop motherboards Some machines have bugs in their UEFI firmware, preventing them from booting (black screen). Linux Kernel 3.0 (and higher versions) includes patches with workarounds for them. It is therefore recommended to use a Linux kernel of version 3.0 or higher. Pre-2008 Macs usually have i386-efi firmware while =2008 Macs have mostly x8664-efi. All Macs capable of running Mac OS X Snow Leopard 64-bit Kernel have x8664 EFI 1.x firmware.
Imac 8,1 has 64-bit EFI. Type the following command in a MacOS terminal: ioreg -l -p IODeviceTree grep firmware-abi Output. Model Integrated Discrete Mac Book Pro5,x PCI:3:0:0 PCI:2:0:0 Mac Book Pro6,x PCI:0:2:0 PCI:1:0:0 Mac Book Pro8,x PCI:0:2:0 PCI:1:0:0 On Mac Book Pro6,x, the screen picture looks distorted when using the Intel integrated graphics.
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This is because the Intel drivers do not recognize the double LVDS link to the screen when no BIOS initializes it. Problem is described. Please recompile your kernel with the or, install it, and add the following parameter boot parameters in grub.cfg: i915.lvdschannels=2 i915.modeset=1 i915.lvdsusessc=0 For kernel 3.5, the patch was included in bug. Beware: the parameter is now spelled 'lvdschannelmode' instead of 'lvdschannels'. Linux boot options In some cases, you need to add these options to linux command line. Acpi=force This is usually not needed with fakebios/loadbios (DMI can be detected with the bios dump), but if you are still having the ATA timeout or USB not response issue, try this option.
Noefi In 2.6.27-2.6.28, amd64 kernel, there is a bug that would cause EFI to hang. Since 2.6.27, it would only map available RAM, and the EFI runtime needs to be mapped with efiioremap. However, efiioremap only reserves MAXEFIIOPAGES (100) pages for EFI, which is not enough for Apple 64-bit firmware (about 17M). To workaround this, you need to pass the 'noefi' option which tells the kernel to disable EFI.
However, some models do not need this workaround (eg Mac Book Pro5,3). Alternatively, you can try the following kernel option, explained in: noexec=off Alternatively, you can try the 3.0-rc1 kernel, which contains several EFI-related fixes. If everything else fails, you can try a known good workaround by installing the 'Run EFI in physical mode',. This patch is less recommended because both MacOS and Windows run in virtual mode, so the EFI firmware is better tested when when the operating system runs in virtual mode.
Also this patch is known to cause when efivars kernel module is used since the module requires EFI virtual mode to work properly. Cd /usr/src sudo patch -p0 -i v2-EFI-Run-EFI-in-physical-mode.patch then recompile and install the kernel. Key mapping As Apple Mac EFI doesn't recognize ctrl sequence, we need to use special key to mimic its function. Define the following mappings in grub.cfg in 1.98: set F1=ctrl-x set F2=ctrl-a set F3=ctrl-e In grub 1.99, you can use the built-in equivalent already defined: Ctrl-X = F10 Ctrl-C = F2 Tested configurations This section contains the list of models on which Linux has been successfully tested in EFI mode.