I installed ubuntu 18.10, for a while my pc turns on automatically when I open it, at first it didn't do that so I had to press the start button to turn it on. Note that I regularly update the system and also when I turn off the PC and do not close it it does not turn on automatically. Is it a bug? How to fix it? Or is it a new feature?
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This has been answered. Have a look at: UnderstandingSuspend – AndreasRZA May 28 '19 at 10:59
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Thank you very much – Fabrice Fabiyi May 29 '19 at 11:05
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Is it a bug?
Unlikely. Well it could have been a bug that got fixed and made it working on your machine.
Or is it a new feature?
No. It has been around for a while: I would assume it is the "wake on lid-open" feature some computers have. It is a setting in the BIOS. Maybe you inadvertently activated it?
Random example from the web:

Rinzwind
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I went through my bios and I didn't find the "wake on lid-open" feature. – Fabrice Fabiyi May 28 '19 at 16:34