Cannot boot system due to start job running for hold

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Go in your safe mode by hitting SHIFT key or ESC. select networking , then drop to root prompt. Then run following commands.

卸载Plymouth： 

sudo apt-get remove plymouth

Now, reboot,

When you reboot, still you may get black or purple screen,

Press Ctrl+Alt+F1 and login with your username and password.

Then run following commands.

GDM ie Gnome display manager was also causing problems for me, so following step was essential for me

I switched to lightdm from gdm3 as display manager.

sudo apt-get install lightdm
sudo dpkg-reconfigure lightdm

When you are prompted, select default display manager as lightdm

Now I was back with desktop , without dash or unity but only icons and wallpaper. now run this.

sudo apt-get install ubuntu-desktop

Now, reboot after this.

The desktop is back!

now, you can install intel graphic drivers again,

原文：https://askubuntu.com/questions/760825/cannot-boot-system-due-to-start-job-running-for-hold

如果在命令行中无法联网，参照这篇blog：https://blog.csdn.net/qq_36561697/article/details/90286524