I am using Ubuntu 64 bit host operating system and have installed VirtualBox Version 5.1.8 r111374 (Qt5.5.1). I cannot create more than 3584 MB Ram for guest Operating System irrespective of which operating system and their versions. I have 16 GB ram in host operating system. How can I assign more than 3584 MB of ram to guest OS

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This link solved my problem. I had installed VirtualBox with .deb file directly, instead what I had to do was to install from "Debian-based Linux distributions" section by scrolling down the VirtualBox downloads page, and follow the instructions.

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