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I have a machine already running Ubuntu 24.04 but I noticed that it is giving a load to my PC as it is a dual core with 6gb ram and 500gb storage. I want to downgrade to Ubuntu 20. I downloaded the Ubuntu 20 created a bootable using Startup Disk Creator. I have changed boot priority and selected the bootable usb drive and when the PC restarts it is going to GNU GRUb where i see Ubuntu which means the already installed Ubuntu will run, Memory Test, Advanced Options which shows the recovery options, Windows Boot Manager. I want to install Ubuntu 20 and I am not seeimg the installation wizard

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