VirtualBox 4.3.20 released and ubuntu installation instructions included

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What is new in virtualbox 4.3.20

This is a maintenance release. The following items were fixed and/or added:

VMM: fixed reboot hang of 32-bit Windows SMP guests (bug #13319, #13462)
VMM: proper Math Fault handling with certain legacy guests (bug #9042, AMD hosts)
VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT on older CPUs that don't support MSR-bitmaps (VT-x only; bugs #13034, #13125, #13311, #13425, #13426, #13463, #13585)
GUI: fix 3D overlay window re-parenting issue when VM goes to full screen mode on X11 hosts.
GUI: fix occasional loss of focus in full-screen mode on X11 host systems (4.3.16 regression)
GUI: Mac OS X: wizards should have Cancel button (bug #12541)
GUI: added a global option to prevent automatic raising of the new window by mouse move with multi-screen guests (bug #8878)
API: accept remote display port 0 as the default RDP port (bug #8534)
VBoxManage: fixed crash when executing showvminfo command under certain circumstances (bug #13190)
ACPI: fixed occasional Guru Meditations in ACPI timer code (4.3.18 regression; bug #13521)
EFI: improved performance of IDE disk access
EFI: fixed a bug in the EFI video driver which prevented Windows to boot in UEFI mode (bug #12022)
EFI: properly announce the amount of RAM for big VMs (bugs #11103 and #13211)
Storage: fixed a crash under certain circumstances when a medium was ejected from a drive attached to the SATA controller without inserting a new medium before pausing or closing the VM (4.3.16 regression)
Storage: fixed an interrupt acknowledge issue causing hanging guests or slower I/O (4.3.18 regression)
Storage: fixed broken resume after the VM was suspended due to a full disk if host I/O caching is used
Storage: fixed a Guru Meditation under certain conditions when using the DevLsiLogic controller with VMs running in raw mode (4.3 regression; bugs #12254, #12655, #12709, #12774, #12886)
Guest Control: fixed a bug which might lead to a crash during recursive copy
SDK: Java COM bindings fixes
iPXE: enable the HTTP download protocol (bug #13628)
Runtime: do not use a fixed stack size creating temporary threads during initialization (bug #13038)
Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)
Windows hosts: fixed DirectSound host audio failure under certain conditions (bug #13418)
Windows hosts: fixed additional cases of 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)
Windows Additions: preserve guest monitor layout when resizing Windows 7 or newer guests
Linux Additions: Linux 3.18 compile fixes (bug #13515)

Install VirtualBox 4.3.20 on ubuntu 14.04/13.10/13.04/12.10

Open the terminal and run the following commands

You need to edit /etc/apt/sources.list

gksudo gedit /etc/apt/sources.list

For ubuntu 14.04 users add the following line

deb http://download.virtualbox.org/virtualbox/debian trusty contrib

For ubuntu 13.10 users add the following line

deb http://download.virtualbox.org/virtualbox/debian saucy contrib

For ubuntu 13.04 users add the following line

deb http://download.virtualbox.org/virtualbox/debian raring contrib

For ubuntu 12.10 users add the following line

deb http://download.virtualbox.org/virtualbox/debian quantal contrib

If you are running ubuntu 12.04 add the following line

deb http://download.virtualbox.org/virtualbox/debian precise contrib

Save and exit the file

Now install PGP key using the following command

wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add --

Update source list

sudo apt-get update

Install virtualbox

sudo apt-get install virtualbox-4.3

If you have problem with the above PPA you can download .deb package from here.Once you have deb package you can double click on it to install this package.

If you want to install virtualbox in ubuntu 14.10

$ sudo add-apt-repository multiverse
$ sudo apt-get update
$ sudo apt-get install virtualbox

But this will install version 4.3.18

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