$ sudo chmod -R 777 <filesystem path>
here <filesystme path> is the android 4 filesystem on your SD card, you need plug in your SD card in your Ubuntu host, then find the rootfs partition of SD card, for example
$ sudo chmod -R 777 /media/rootfs
finally, you can verify it.
$ ll /media/rootfs
drwxrwxrwx 9 root root 4096 2011-11-24 15:04 rootfs/
资源网站:http://code.google.com/p/rowboat/wiki/ICSonBeagleboard