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GeoB99: Going to get Fedora then.. Fedora was fast for me even if I had 512MB in my old computer, well.. when I'll get fedora on I'll info everyone here.
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I have 1GB. How much would be good for a virtualmachine, don't forget that i'm using Ubuntu 15.10 in it.
Even if it requires only 512MB or RAM, VirtualBox will need more. About 768MB. I'm sure that your host (read: the OS that really running) will lag alot once you start the Virtual Machine.