A couple of days ago all was working fine on my macOS 10.15.5 with VirtualBox 6.0.20.
VirtualBox 6.1.2 will not run Catalina 10.15.2 and later guests. Virtualbox 6.1.0 added support for booting APFS.Unfortunately there is a problem if you do not have 10.15.1 version of Install macOS Catalina.app. There is a bug in VirtualBox which is exposed by 10.15.2 and later versions of boot.efi.See this VirtualBox forum thread Catalina 10.15.2 does not start. When setup is finished, Windows 10 will be running in VirtualBox. Navicat for mysql. Is microsoft edge available for mac. When you’re finished, quit VirtualBox like any other application and Windows 10 will shut down. When you want to run Windows again in Mac OS X, just launch VirtualBox again, select your Windows 10 virtual machine, and click the “Start” button to boot Windows in the app. For Mac OS X hosts, Oracle VirtualBox ships in a disk image ( dmg ) file. Perform the following steps: Double-click on that file to have its contents mounted.
George mason blackboard. Multiple client options: choose Webex Teams for an integrated calling experience, or use a standalone Cisco Webex Calling soft client app. Delivered by George Mason Telecom Global Cisco UC partner offering broad, world-wide coverage and expertise in the Cisco Cloud Calling stack to. Webex Retirement Cisco Webex service offerings are being phased out at Mason to provide a more streamlined set of services. Alternate solutions are available including Zoom, Microsoft Teams, and Blackboard Collaborate. See Webex Retirement Roadmap for details. Webex Retirement Roadmap Cisco Webex service offerings are being phased out at Mason to provide a more streamlined set of services. Alternate solutions are available including Zoom, Microsoft Teams, and Blackboard Collaborate. Webex services will be shut down on May 31, 2021. We would like to show you a description here but the site won’t allow us.
Mac In Virtualbox
I have Windows10 and Ubuntu. Today I needed Windows and when started I got the Windows 'blue' screen saying that some critical system files were not found and it tried to repair itself, for no avail.
Then I tried Ubuntu, which simply didn't start and its status turned to 'Aborted'
Making a long story short. I did a clean install of VirtualBox 6.1.10, used new and backed up VDI files for Windows and Linux. Created new VM re-using my VDI disks and tested, trying to look at the logs.
It simply getting aborted whatever I try. I have no idea of what's going on. Looking at my log at

- Code: Select allExpand viewCollapse view
~/VirtualBox VMs/Ubuntu_old/Logs/VBox.log

- Code: Select allExpand viewCollapse view
..
00:00:01.897119 Firmware type: failed - VERR_NOT_SUPPORTED
..
# the end of my log
00:00:02.211154 VMMDev: Guest Log: BIOS: AHCI 0-P#0: PCHS=16383/16/63 LCHS=1024/255/63 0x0000000001000000 sectors
00:00:02.212571 PIT: mode=2 count=0x48d3 (18643) - 64.00 Hz (ch=0)
00:00:02.229405 Display::i_handleDisplayResize: uScreenId=0 pvVRAM=0000000116cf5000 w=640 h=480 bpp=32 cbLine=0xA00 flags=0x0 origin=0,0
00:00:02.692486 GUI: UIMachineViewNormal::resendSizeHint: Restoring guest size-hint for screen 0 to 800x600
00:00:02.700394 GUI: 2D video acceleration is disabled
00:00:02.700470 GUI: HID LEDs sync is enabled
00:00:02.738224 GUI: UIMachineLogicNormal::sltCheckForRequestedVisualStateType: Requested-state=0, Machine-state=5
00:00:04.694171 PIT: mode=2 count=0x10000 (65536) - 18.20 Hz (ch=0)
00:00:04.695038 VMMDev: Guest Log: BIOS: Boot : bseqnr=1, bootseq=0231
00:00:04.695713 VMMDev: Guest Log: BIOS: Boot from Floppy 0 failed
00:00:04.696378 VMMDev: Guest Log: BIOS: Boot : bseqnr=2, bootseq=0023
00:00:04.697268 VMMDev: Guest Log: BIOS: CDROM boot failure code : 0003
00:00:04.697644 VMMDev: Guest Log: BIOS: Boot from CD-ROM failed
00:00:04.698085 VMMDev: Guest Log: BIOS: Boot : bseqnr=3, bootseq=0002
00:00:04.698938 VMMDev: Guest Log: BIOS: Booting from Hard Disk..
00:00:04.749144 Display::i_handleDisplayResize: uScreenId=0 pvVRAM=0000000000000000 w=720 h=400 bpp=0 cbLine=0x0 flags=0x0 origin=0,0
00:00:05.353478 Display::i_handleDisplayResize: uScreenId=0 pvVRAM=0000000116e21000 w=640 h=480 bpp=32 cbLine=0xA00 flags=0x0 origin=0,0
I can run Ubuntu memory test from the Grub option and starting the VM in headless mode the status shows 'running' and that's all.
I hope someone can help me somehow.

Thanks in advance,
Virtualbox 6 Macos Guest Additions
Alan