How to capture Virtual Box Machine Packet using Wireshark

VBoxManage modifyvm "ubuntu-server" --nictrace1 on --nictracefile1 /root/file.pcap
VirtualBox -startvm "ubuntu-server" &

tail -f -c +0 /root/file.pcap | wireshark -k -i -

or

cat /root/file.pcap | wireshark -k -i -