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Ubuntu doesn't use the second core of my CPU, ubuntu can recognize it but even when the first core is really busy (+90%) the second one keeps in 0,0% of use.

Why is that? This PC came with ubuntu 16.04 and i manually upgraded it to 18.04, maybe i have and old driver?

Edit Summary: 1: i cannot answer that question, anyways it doesn't matters but My CPU is: Intel(R) Celeron(R) CPU N3350 @ 1.10GHz. 2 : microsoft edge, zoom are the principal problems, edge by it self can make the core 1 of the cpu hit 100% percent of use.

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    There is an insufficient amount of information in your question to provide a decent answer. Could you update the question to include: (1) The brand and model of computer you're using / (2) what application(s) you are using that have you worried about CPU usage. This will make it much easier to provide a more accurate suggestion or answer 👍🏻
    – matigo
    May 20, 2021 at 15:10
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    Install stress and check stress --cpu 2. I guess your application just does not use multithreading.
    – pLumo
    May 20, 2021 at 15:37

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