Linux重新启动后提示 Failed to load SELinux policy. Freezing系统hung住

重新启动之前修改了selinux的配置，disable selinux，估计多半是修改的时候哪里改错了。
在网上搜索了一下，解决方案是在系统启动时找到 linux16 那一行，在启动配置像里加一项selinux=0。具体做法是在启动页面，选择要启动的内核 按 E，结果我按了E后，找不到linux16那一行，仔细一看，还有个光标向下的箭头，接着向下按，找到了，改好后如图：

然后按ctrol+X，系统可以启动了，启动后检查配置文件/etc/selinux/config中的“SELINUX”参数的值：

错误非常明显，改成下面的就正常了：

$ cat /etc/selinux/config # This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=enforcing
# SELINUXTYPE= can take one of three values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected. 
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

手工关闭方法如下：

[oracle@localhost ~]$ sudo sestatus
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      31
[oracle@localhost ~]$  sudo -i
[root@localhost ~]# setenforce 
usage:  setenforce [ Enforcing | Permissive | 1 | 0 ]
[root@localhost ~]# setenforce 0
[root@localhost ~]# sestatus
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   permissive
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      31

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