I have installed (and reinstalled multiple times) Ubuntu Server 14.10 on a Mac Mini 6,2 (late 2012).
The install media is a USB drive. The computer is connected to the internet through ethernet cable. There is nothing substantial to report from the installation[1].
After finishing the installation and rebooting I am presented with the blinking image of a folder with a question mark. I can use the same USB drive and go into recovery mode.
Using a different USB drive I have created a rEFInd drive. If I leave this USB drive connected to the computer it will automatically boot to grub and then load Ubuntu. Yet having the computer depend on this external USB drive is less than ideal.
I have attempted to use gptsync to fix the issue as I remember that this solved the problem on a different mac I also own(MacBook 4,1 - early 2008).
$ sudo gptsync /dev/sda
Current GPT partition table:
# Start LBA End LBA Type
1 2048 1050623 Unknown
2 1050624 1920161791 Unknown
3 1920161792 1953523711 Linux Swap
Current MBR partition table:
# A Start LBA End LBA Type
1 1 2047 ee EFI Protective
2 2048 1050623 83 Linux
3 * 1050624 1920161791 83 Linux
4 1920161792 1953523711 82 Linux swap / Solaris
Status: GPT partition of type 'Unknown' found, will not touch this disk.
Other encantations I have attempted:
- sudo grub-install /dev/sda - after reboot, goes back to flashing folder with question mark
- sudo grub-macbless /dev/sda - flashing folder with question mark
- sudo update-grub - same folder as before
For now I am only able to boot the computer if the rEFInd USB drive is connected.
[1] the keyboard detection fails to automatically recognize the keyboard. I am sure of this as I retried multiple times.