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Turn off your virtual machine
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Go to
Settings > SCSI Controller > Hard Drive. In the Media section, edit the Virtual Hard Disk and expand to desired space -
Start the virtual machine and connect to it
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Install the GParted by running the command
sudo apt install gparted -
Open the GParted GUI (or run the command
sudo gpartedto open it) -
Go through the resizing process on the application's GUI. You could follow this Tutorial on Youtube.
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Reboot the machine and done!
References: