Yes, Virt-Manager does have a slightly steeper learning curve than VirtualBox. (I'll write an article soon on how to create a VM with Virt-Manager.) However, the reward for getting up to speed is a ...
If you need to use virtual machines on Linux, try Virt-Manager. Virt-Manager is more reliable than VirtualBox. Virt-Manager is completely free and open-source. I'm a long-time supporter of VirtualBox.
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