I made dual booting image for ODROID-U3.
http://codewalkerster.blogspot.kr/2014/03/dual-booting-android-and-ubuntu-on.html?m=1
We will make dual booting image for ODROID-C2.
Make bootable android media(eMMC or SD).
http://odroid.com/dokuwiki/doku.php?id=en:c2_release_androidDownload Ubuntu Image.
http://odroid.com/dokuwiki/doku.php?id=en:c2_release_linux_ubuntuCopy rootfs and boot partition of Ubuntu to your desktop Ubuntu.
$ mkdir boot$ sudo cp -a /media/username/boot/* boot/
$ mkdir rootfs
$ sudo cp -a /media/username/rootfs/* rootfs/
Delete rootfs/aafirstboot
$ rm -rf rootfs/aafirstboot
Edit rootfs/etc/fstab
$ vi rootfs/etc/fstab
LABEL=VFAT/media/bootvfatdefaults,rw,owner,flush,umask=000 0 0
Chagne userdata partition UUID.
$ sudo tune2fs /dev/sdX4 -U e139ce78-9841-40fe-8823-96a304a09859
Copy Ubuntu files
$ mv /media/username/VFAT/boot. ini /media/username/VFAT/boot. ini.android
$ cp boot/* /media/username/VFAT/
$ sudo cp rootfs/* /media/username/e139ce78-9841-40fe-8823-96a304a09859/ -a
$ sync
Make script to change OS.
in Ubuntu
$ vi boot_android.sh
#!/bin/bash
mv /media/boot/boot.ini /media/boot/boot.ini.ubuntu
mv /media/boot/boot.ini.android /media/boot/boot.ini
reboot
in Adnroid
$ su
# mount -o rw,remount /
# vi /system/bin/boot_ubuntu.sh
#!/bin/sh
mv /storage/internal/boot.ini /storage/internal/boot.ini.ubuntu
mv /storage/internal/boot.ini.android /storage/internal/boot.ini
reboot
# chmod 777 /system/bin/boot_ubuntu.sh