You would need to refer to this page for instructions on how to use rEFIt.
How to select a different startup disk
Give it a whirl and let us know. Hmm, that's quite a leap! Actually there are just two logical partitions - one of which is swap Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 9 years, 11 months ago. Active 9 years, 11 months ago. Viewed 3k times. Updated the solution in the below comments - i got a strong feeling this will get your EFI back.
I have no idea. This is an inherited Mac Mini. DVD certainly recognised within Ubuntu That is, until things took another turn for the worse. Now that the mini was working again, I ran Software Update. After installing some OS updates, I restarted Much to my surprise, on the first boot after the swap, the Mac mini again started up normally and functioned perfectly.
Now I was really annoyed. Still, the fact that it booted normally immediately after swapping the RAM got me thinking.
macos - Can't boot a Mac Mini from CD - Super User
This would have saved me a lot of time and frustration. I rebooted holding down the Option key. Normally, doing this would present a special screen showing all accessible bootable volumes. And then everything made sense. With such a password enabled, you or, more important from a security standpoint, another person cannot access any startup options, including changing the boot volume or activating any special startup modes. It is not true that Linux can only be installed in a single partition on Macs Most texts on the Internet tell us about limitations, which in certain cases usually for triple boot options prevent Linux from even having its swap defined as an external partition.
This is not true, we are only limited by the disk-make - hardware platform, namely, SCSI disks, which are deployed with Mac Minis, allow 16 partitions, whereas IDE drives allow over a hundred partitions. To make it possible for "macosx" to load on a hard drive, would require you to set the partitioning scheme back to GPT and reformat the hard drive again needless to say switching between the MBR and GPT with Mac's Disk Utility program is always a data destructive action.
A Single Partition Linux Is a Poor Solution One has to be aware of the fact that the two different disk partitioning schemes, when creating more than four partitions differ! Namely, in order to create more than four partitions on old BIOS and MBR based systems the partitions above the fourth had to be defined as extended partitions. However, GPT partitioning scheme doesn't allow you to define the extended partition, but does you limit to define any number your disk hardware platform will permit.
This additionally complicates installation procedures by expanding a number of different installation variants, which should be considered in different situations, hence creating a great number of options, which if not specified properly greatly increase a chance your installation will fail.
The best way to address these issues is to identify all the possible installation scenarios and write installation instructions for each of them. This, therefore, is the reason for the above "Menu of installation types". To the above complications, a very popular, though in my opinion inadequate, is the simplest solution namely installing Linux in a single partition, with swap defined as a separate partition. However, as mentioned above even this may become a problem when installing a triple boot system, in which case many suggest to use a swap file within Linux partition itself rather than a partition of its own.
It was this last, for me utterly unacceptable scenario, that prompted me to search for a better and more adequate solution, which at the end shed enough light on the obfuscated area of Linux dual boots on Apple computers, which enabled me to write "yet another HOWLinux-on-Apple". On your first read you may not yet know what is really needed from the above list.
However this should be done in a functioning MacOSX. Reading or skimming this document ahead before you actually wipe out your disk is a prudent thing to do.
Installation Issues Commonly Seen with macOS
Of course before starting any of the following procedures you should know which installation path you wish to follow. For some installation types this step is unnecessary, because it is intrinsic to Mac OS X installation, following installation path it will be taken care of. For those of you who wish to understand each step, let's look at the issues more closely.
One can change this setting only with Mac's Installation CD.
How to choose a startup disk on your Mac to boot from USB
Since this is the disk formatting option, it is part of the disk formatting process. For this flag to take effect it is required that you reformat the hard drive, hence it is not possible to change this flag while you are logged into your MacOSX as a Mack user. Select the the hard drive in the left hand side panel containing the brand name of your HD , not the partition.
On the right five tabs appear. Click Partition tab. Volume Scheme panel appears. Above it is a choice button, containing either the word Current or one of the "1 Partition, 2 Partitions, You can select here a number of partitions you wish to create. Normally, if you are installing a dual-boot or a triple-boot system, you'd set here "2 Partitions" and then by clicking on them, adjust and set desired values.
The first partition should be set for MacOSX - i. Unless you are only reinstalling MacOS as the only OS, you have for the dual-boot or for a triple boot system, selected "2 Partitions" above, and in this case by clicking on the second partition, you are going to set only the field Format to "Free Space" , to prepare it for further partitioning during Linux installation. This last click will finally cause the disk organization to be rewritten, some formatting not all, only what you selected is done, and all your data are lost.
Arguably, depending on your installation type, the above steps may or may not be needed.
Nevertheless, if you start messing up with your original MacOS installation there is a chance that at one point you'll need to use Apple's Disk Utility to recover or reset your original disk setup, and you are much better off knowing what the important settings and options are for. It is equally important to know that changing this flag in either direction with the current Apple's Disk Utility program requires disk partitioning, and formatting which destroys all your data on the hard drive.
A particular set of required actions for any installation path will be laid down when discussing individual installation variants. Click the button Options and select or "Master Boot Record". Click Partition button at the bottom.
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Start the installation of Ubuntu to your hard drive, by clicking the Installation icon on the Desktop. Select your Language, Time zone, Keyboard and enter user information; clicking Forward button will begin the parameter entry sequence titled Prepare Partitioning. Ready to install screen appears, here we will, by merely pressing Forward button, accept the suggested location for grub. After this screen is exited, you will have to wait until the formatting is completed and the installation process will start copying files from the CD to the hard drive.
The copying itself will last over 20 minutes.
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During this time while files are being copied you will have to execute a command to write Linux parameters into the MBR , which is explained next. You are now ready to press the Forward button and exit the Ready to install screen, after which the disk will be partitioned to contain Linux and swap partitions. The new partitions will be formatted, and after that the installation will start. Enter the following commands. Do not restart yet! However, there is an additional step for those that miss the visual identification of Linux i.
But be careful it's easy to make to many Optional step with your bootable rEFIt CD, which applies to all installation types and is described at the and see: Making Booting Prettier.