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0 More then one harddisk possible problem and solution:
IMPORTANT: When you have more then one harddisk:
I have noticed weird behaviour; sometimes the harddisk names were switched! In MacOS X Disk Utility one disk was sda (can be different name!) and the other sdb (can be different name!), but in Linux Distro with Parted the names where switched.
In MacOS X the two harddisks have also got an EFI partition. And that seams a big problem for Linux Distro installers! The Linux Distro installers install the EFI boot in the wrong EFI partition.
SOLUTION:
Get rid of the EFI partition that isn't used by MacOS X, it isn't used anyway. But be careful what you do, check double! I have simple erased the EFI partition from the sdb (can be different name!) harddisk and changed the name to EFI_NOT.
After that it was easier to install dual boot MacOS X and Linux Distro.
1 MacOS X clean install (if possible)
2 MacOS X only El Capitan:
Disable SIP (System Integrity Protection) from Recovery HD
Recovery HD -> Terminal -> csrutil disable -> enter (return)
http://www.rodsbooks.com/refind/sip.html
3 Install latest rEFInd
http://www.rodsbooks.com/refind/installing.html
4 Test rEFInd
when it works: Recovery HD -> Terminal -> csrutil enable -> enter (return) (OPTIONAL for SAVETY)
5 MacOS X -> Disk Utility -> you system disk -> Partition
Create an Antergos FAT32 partition from at least (minimum) 30Gb after your MacOS X partition
6 Create Antergos Live USB with dd:
see here for example: https://en.opensuse.org/SDB:Create_a_Live_USB_stick_using_Mac_OS_x
some extra information:
the quality from the iso download: do at least a MD5 CHECK,
the quality from usb keys: buy from a WELLKNOWN COMPANY,
the condition from the usb key: do first a complete CLEAN ERASE,
the partition: only ONE PARTITION,
the user that’s doing this: best is to do this with ROOT USER,
the way of doing the dd clone: let the TERMINAL FINISH THE DD JOB without touching your computer, even when it takes hours!
7 (re)Boot your laptop with ALT key pressed (don't use rEFInd yet!)
8 Choose Antergos Live USB (called "efi boot" or "Windows" sometimes)
9 Choose from the menu Antergos UEFI CD/DVD (normally the first one in the list) not the other ones (again thanks to @karasu) and wait!
10 Choose "Try it" and test the Live USB session connected with internet thru ethernet cable, wait because Cnchi has to be completely updated to latest version wait until the message: Cnchi up to date!
meanwhile you wait: start Gparted and format your Antergos FAT32 partition to ext4 partition
11.1 install Antergos with Cnchi
11.1.1 go thru the installer and let all settings for what they are for now
11.1.2 keep Keyboard French for AZERTY keyboards (important one for me)
11.1.3 choose your desktop, i have chosen Gnome (so i have only experience for this one)
11.2 partition scheme: follow this steps ones and very concentrated in one track:
11.2.1 Select /dev/sda1 (can be different name!)
Click ...
Choose /boot/efi EFI (DON'T FORMAT!)
Click Ok
be sure that you see the GREEN small box with checked EFI
In my situation several times it wasn't there or checked and Antergos will fail!
11.2.2 Don't touch /dev/sda2 (can be different name!) OS X
11.2.3 Don't touch /dev/sda3 (can be different name!) Recovery
Select /dev/sda? (can be different name!) 100MiB hfs+ Boot Arch Linux from the Apple boot loader OPTIONAL! I have chosen to have the possibility to boot Antergos in two ways: EFI and Apple boot loader GRUB.
11.2.4 Select /dev/sda4 (can be different name!) /root ext4
Click ...
Choose mount at /
Choose ext4 “Format” box
click format box only ONE TIME
be sure that you see the GREEN small box with checked /root
In my situation several times it wasn't there or checked and Antergos will fail!
Select /dev/sdb? (can be different name!) /home ext4 home
11.2.5 Elect /dev/sd.. what you want for your /home OPTIONAL
Choose mount at /home
ext4 “Format” box
click format box only ONE TIME
I put this as optional because like that the admin is in the root, so the root user is in the system partition, better for backup, later you can put your regularly user(s) in /home
11.2.6 Choose boot loader at /dev/sda (can be different name!)
11.2.7 YES, GO, START! ?