This is a major update. The following major new features were added:
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VM export to Oracle Cloud (OPC)
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Unattended guest installation (bug #5810; see Section 3.2, “Unattended guest installation”)
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Overhauled VM selector GUI (improved tools VM / global tools handling, new icons)
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Added experimental audio support for video recording
In addition, the following items were fixed and/or added:
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VMM: fixed reason for recent Linux kernels on also recent CPU models warning about "XSAVE consistency problem"
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GUI: Virtual Media Manager rework allowing to manage media attributes, like size, location, type and description
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GUI: Host-only Network Manager implemented to simplify managing corresponding networks and their attributes
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GUI: Snapshot Pane rework allowing to manage snapshot attributes, like name and description; reworked snapshot details which looks more clear, corresponds to VM Details pane and reflects current VM state difference according to last snapshot taken
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GUI: Audio settings extended with possibility to enable/disable audio input/output; corresponding changed were done to Audio and Video Capture settings pages; VM Devices menu and status-bar extended with corresponding actions and indicator as well
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GUI: improvements with accessibility support
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GUI: Fixed double mouse cursor when using mouse integration without Guest Additions, actually a Qt 5.6 bug fixed with QT 5.6.3 (Mac OS X hosts only; bug #15610)
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Audio: implemented (optional) device enumeration support for audio backends
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Audio: implemented support for host device callbacks (e.g. when adding or removing an audio device)
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Audio: HDA emulation now uses asynchronous data processing in separate threads
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Audio: implemented ability to enable or disable audio input / output on-the-fly
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Storage: implemented support for CUE/BIN images as CD/DVD media including multiple tracks
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Storage: implemented support for the controller memory buffer feature for NVMe
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Storage: first milestone of the I/O stack redesign landed
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E1000: Fix for Windows XP freeze when booting with unplugged cable
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NAT network: do not skip some port forwarding setup when multiple VMs are active (Windows hosts only; bug #17041)
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Serial: fixed extremely rare misbehavior on VM poweroff
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EFI: better video mode handling, supporting custom video modes and easier configuration (bug #6783)
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BIOS: properly report floppy logical sectors per track for unusual formats
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BIOS: update ATA disk parameter table vectors only if there is actually a corresponding ATA disk attached
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PXE: speed up booting by better handling pending packets when the link is not up yet
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VBoxManage: handle CPUID sub-leaf overrides better
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Windows Additions: fix several 3D related crashes
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Solaris hosts: allow increasing MTU size for host-only adapter to 9706 bytes to support jumbo frames
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Linux Additions: on systems using systemd, make sure that only the Guest Additions timesync service is active
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many unlisted fixes and improvements