Hello Kevin,
I recently built android on Ubuntu 13.04 for arndale board.
acpica-tools was available and was installed without problem on 13.04. May be 10.04 is too old.
Regarding the cp error, I also faced this error. Then I build with pinned-manifest.xml and it succeeded.
Can you trying downloading the pinned-manifest.xml file from http://releases.linaro.org/<VERSION>/... and try the below command -
./linaro_android_build_cmds.sh -m pinned-manifest.xml
-- Thanks, -Meraj