A solution to my installation problems...
I found the system partition in use, or such errors.
With some looking around on the xda, I decided to try
formating everything except sd and internal memory, that did not help before,
then make sure the system and everything was mounted
I had removed the lines
"show_progress(0.750000, 0);
format("ext4", "EMMC", "/dev/block/mmcblk0p12", "0", "/system");
mount("ext4", "EMMC", "/dev/block/mmcblk0p12", "/system", "max_batch_time=0,commit=1,data=ordered,barrier=1,errors=panic,nodelalloc");"
from updater script....
Then while flashing gapps etc superuser etc, I also flashed hikari_dual_recovery_boot-aosp-5.0.zip from
http://d-h.st/users/paul-xxx/?fld_id=41762#files
So that I don't need to flash boot.img using fastboot when I want to change to another rom or clear cache etc (I Hope this boot.img will work fine...)
and now I could install the CM12... it is running.
So if someone gets the same error, this is how I did it
I do not think if this is related but for most roms I always need to remove the first "hikari /acro-s / lt26w" lines from the updater script. (At some time, my device started thinking in recoveries it is not an acro-s, I wish I could repair that...)
