This is a maintenance release. The following items were fixed and/or added:
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Virtualization core: Fixed a rare issue with ICEBP instruction causing guru meditations on Intel hosts (6.1.0 regression; bug #19171)
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Virtualization core: Fixed macOS Catalina guests failing to boot after upgrading to 10.15.2 onwards (bug #19188)
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GUI: Recent NLS integration and bug fixes for GUI and Qt translation tags
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USB: Fixed isochronous transfers to the VM for xHCI
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Serial: Fixed buffer handling, avoiding receiving stale data when the receive queue is flushed (bug #18671)
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Serial: Improve host serial port passthrough handling on Windows host
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VBoxManage: Restore old --clipboard option for modifyvm command
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macOS host: Use hardened runtime and request the needed entitlements, meeting latest notarization rules which also required moving VirtualBoxVM executable
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macOS host: Update osxfuse to v3.10.4
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Windows host: Update Italian translation of installer
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Windows host: Improve shared folder compatibility with POSIX append semantic (bug #19003)
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Windows host: Restore the ability to run VMs through Hyper-V, at the expense of performance
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Linux guest: Support Linux 5.5 (bug #19145)
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Linux guest: Shared folder fix for loopback mounting of images
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BIOS: Always report non-ATA disks as ready
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BIOS: Report EFI support through DMI table (bug 19144)
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VGA BIOS: Reduce stack space usage for INT 10h handlers