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重装Windows后如何进入Linux Grub

重装了Windows之后，原来Linux生成的grub2多系统启动菜单被覆盖了，该如何进入Linux呢？
这时，你需要一张Ubuntu的LIVE光盘或者LIVE U盘。用这个LIVE盘启动，进入LIVE系统后，在终端中依次执行如下命令，即可恢复重建grub2启动菜单：

cd /media（进入media文件夹）
sudo mkdir temp（在media下新建一个temp文件夹）
mount /dev/sda7 /media/temp（把Ubuntu的安装分区挂载到temp文件夹下。这里假设你的Ubuntu是安装在sda7这个分区的。）
grub-install --root-directory=/media/temp /dev/sda（运行grub安装程序，并指定安装在第一硬盘。）

然后重启电脑，就可以看到熟悉的grub2启动菜单了。
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