ok, i found how to remove ACPI=OFF definitely from grub. just Edit the file named menu.lst and find the kernel line like in grub, and remove ACPI=OFF
to edit this file, just press ALT+F2, and type "gksudo gedit" and search for the file in local disk/boot/grub/ removig "ACPI=OFF" and adding "pnpbios=OFF", solved my problem. -- Jaunty & Interpid: won't power off on shutdown or reboot https://bugs.launchpad.net/bugs/326988 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs