Error in 'powering on' Ubuntu OS in virtual box

Development
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After installing Virtual box and Ubuntu Server, and following certain instructions in virtualizing Ubuntu OS. Also referring the installed Ubuntu hard disk(F) while powering on, this error appears!

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Please try these ways:

  1. Go to your BIOS settings (By pressing F12, F2, F8, or Delete, … depends on machine).And make sure Virtualization option (It can be have names like VT-d or AMD-V or Intel Virtualization Technology or Virtualization or …) to be enabled . (And if its be disable make it enable)
  2. Go to VirtualBox settings >> System >> MotherboardAnd then increase RAM size (For example to 2GB is good).
  3. Go to VirtualBox settings >> System >> AccelerationAnd then Uncheck the Enable VT-x/AMD-V option.
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If i increase RAM size correctly to 2GB, i get this ‘Invalid Settings Detected’.
otherwise if its even 1MB less the reaching 2GB, then this does not appear…
Is it Ok or should i reduce?

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Go to the BIOS settings page in your PC/Laptop (Check Manufacturer site for key combination while booting your device). Turn on Intel Virtualization from Advanced Settings Tab (It will be like Intel-VT).
Another reason this thing happens if you are on Windows 10 pro, is that your hyper-v (hypervisor) if turned on. Go to “turn additional features on or off” and turn off this setting.
This will work then.

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Could you please make a video