挂载个硬盘，没有测试，FSTAB填错， 就起不来了，
搞个启动u盘，然后重启进入系统，
命令行：
manjaro-chroot -a
修改FSTAB，保存重启，搞定。
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If you are unable to recover using the installed system you can use another medium such as a CD or USB
Create or just reuse an already existing Manjaro Live USB (such as the one you used to install your system).
Once booted in the live system issue the following command in the terminal:
manjaro-chroot -a
Follow the prompts and you should have access to your installed system.