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Increase memory in virtual box

cd ~/VirtualBox VMs/YOUR_VM_NAME

VBoxManage modifyhd YOUR_HARD_DISK.vdi --resize 8096
  • change disk size using special iso https://downloads.sourceforge.net/gparted/gparted-live-1.6.0-3-amd64.iso

in virtual machine ubuntu: 

sudo pvresize /dev/sda3


sudo lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv

sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv