编辑/etc/inittab文件
# inittab is only used by upstart for the default runlevel. # # ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. # # System initialization is started by /etc/init/rcS.conf # # Individual runlevels are started by /etc/init/rc.conf # # Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf # # Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf, # with configuration in /etc/sysconfig/init. # # For information on how to write upstart event handlers, or how # upstart works, see init(5), init(8), and initctl(8). # # Default runlevel. The runlevels used are: # 0 - halt (Do NOT set initdefault to this) # 1 - Single user mode # 2 - Multiuser, without NFS (The same as 3, if you do not have networking) # 3 - Full multiuser mode # 4 - unused # 5 - X11 # 6 - reboot (Do NOT set initdefault to this) # id:3:initdefault:
找到这行代码：id:3:initdefault:
它定义Linux进入系统后执行的init动作级别，共有以下6个级别：
级别0，挂起、关机模式;
级别1，单用户模式;
级别2，多用户模式，但没有网络功能;
级别3，全功能的单用户模式;
级别4，没用到;
级别5，X11模式，也就是图形化界面模式;
级别6，重起模式。
将原来的“3”修改成“5”，然后reboot重启系统即可。
推荐教程：linux教程
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