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I believe this is the same issue I had, but you don't use disk encryption so you just see a black screen shortly on boot and then are greeted by the login manager. See here for my solution: Black screen instead of plymouth (Sorry, I can't post this as a comment because I don't have enough reputation)


1

If you simply bound the shortcut to shutdown the default behavior for that is to schedule a shutdown in 60 seconds. You probably want to bind to the command: shutdown now


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