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First read this to put you in a good mood:
[HowTo] become a Manjaro power user when you're a wizard at Windows but a N00b at Manjaro / Linux
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Now re-install your system as that’s going to be easier and faster than finding out what exactly went wrong on an offline machine.
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If you don’t like the above and would have a working Ethernet connection, the first thing to do would be to post an
inxi --admin --verbosity=7 --filter --no-host --width
because now we have zero information and won’t even know where to start to have a look to see what’s wrong, let alone suggest a solution.