CentOS7.4 a start job is running for wait for plymouth boot 解决办法

昨天在系统上运行了一下yum update 一看，出现了很多更新，于是乎和以前一样，点了下Y，系统就慢慢的更新，等更新完毕重启后，就悲剧了，桌面怎么也出不来，下载最新的NVIDIA驱动安装也安装不上，报各种错误，于是到/var/log目录下，看到了 nvidia-uninstall.log 这个日志文件，其内容如下：

[root@localhost log]# cat nvidia-uninstall.log 
nvidia-installer log file '/var/log/nvidia-uninstall.log'
creation time: Tue Jan 30 16:17:23 2018
installer version: 384.69

PATH: /usr/local/maven/bin:/usr/local/protoc/bin:/datainfo/nodejsdate/globalnode/bin:/usr/local/go/bin:/datainfo/work/golang/goproject/bin:/datainfo/work/golang/goproject:/usr/local/winrar:/usr/application/nodejs/bin:/usr/local/jdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/application/010editor:/root/bin

nvidia-installer command line:
    /usr/bin/nvidia-uninstall

Unable to load: nvidia-installer ncurses v6 user interface

Using: nvidia-installer ncurses user interface
-> Detected 56 CPUs online; setting concurrency level to 32.
-> Tagging shared libraries with chcon -t textrel_shlib_t.
-> If you plan to no longer use the NVIDIA driver, you should make sure that no X screens are configured to use the NVIDIA X driver in your X configuration file. If you used nvidia-xconfig to configure X, it may have created a backup of your original configuration. Would you like to run `nvidia-xconfig --restore-original-backup` to attempt restoration of the original X configuration file? (Answer: Yes)
ERROR: Failed to run `/usr/bin/nvidia-xconfig --restore-original-backup`:

WARNING: Unable to locate/open X configuration file.


ERROR: Unable to restore from original backup file
       '/etc/X11/xorg.conf.nvidia-xconfig-original' (No such file or
       directory)
-> Parsing log file:
-> done.
-> Validating previous installation:
ERROR: File '/usr/lib64/xorg/modules/extensions/libglx.so' is not a symbolic link.
-> done.
WARNING: Your driver installation has been altered since it was initially installed; this may happen, for example, if you have since installed the NVIDIA driver through a mechanism other than nvidia-installer (such as your distribution's native package management system).  nvidia-installer will attempt to uninstall as best it can.  Please see the file '/var/log/nvidia-uninstall.log' for details.
-> Uninstalling NVIDIA Accelerated Graphics Driver for Linux-x86_64 (1.0-38469 (384.69)):
-> DKMS module detected; removing...

于是手动运行/usr/bin/nvidia-uninstall 卸载已经安装好的NVIDIA驱动，卸载的时候也出现错误，对最终还是卸载完成，重启，再次安装最新的NVIDIA驱动，安装的比较慢，最后成功装上，运行startx，熟悉的界面出来了。