我无法关机。每当我尝试关机时，它都会重新启动。我正在运行 Ubuntu 64 位 12.10。它是台式电脑。没有双启动。我之前有 Windows 7。显卡驱动是AMD radeon HD6670。主板是Intel。
我已经运行了引导修复，这是结果：
Boot Info Script 0.61.full + Boot-Repair extra info [Boot-Info November 20th 2012]
============================= Boot Info Summary: ===============================
=> Grub2 (v2.00) is installed in the MBR of /dev/sda and looks at sector 1 of
the same hard drive for core.img. core.img is at this location and looks
in partition 1 for (,msdos1)/boot/grub.
sda1: __________________________________________________________________________
File system: ext4
Boot sector type: -
Boot sector info:
Operating System: Ubuntu 12.10
Boot …