Ubuntu 20.04 LTS change hostname permanently

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I am a brand-new Ubuntu Linux 20.04 LTS VM user. By default, my server name to ‘localhost’ during cloud installation, but now I would like to change the computer name to ‘ubuntu-2004-nixcraft’. Can you tell me how do I remove the localhost and set it to ubuntu-2004-nixcraft on Ubuntu 20.04 Linux? How do I change the Ubuntu computer name from ‘localhost’ to ‘ubuntu-2004-nixcraft’? Can you tell me more about Ubuntu Linux change hostname command?

Linux find Windows 10 OEM product key command

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I removed and installed Ubuntu Linux 16.04 LTS on my development Lenovo laptop. However, I need to use my Windows 10 pro in KVM VM for running the accounting app. How do I find and print my embedded Windows 10 pro key from a Linux command line option? How can I retrieve Microsoft Windows 8 and 10 OEM product key from BIOS?

Change netplan renderer from networkd to NetworkManager

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I prefer to use NetworkManager on my Ubuntu desktop, but currently, it is using networkd. As a result, I cannot set up or configure NetworkManager using GUI tools. Is there anyway to change netplan renderer from networkd to NetworkManager running on Ubuntu Linux? How can I change netplan renderer in Ubuntu Linux?