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VBoxManage controlvm vm1 poweroff
VBoxManage controlvm vm2 poweroff
VBoxManage unregistervm --delete vm1
VBoxManage unregistervm --delete vm2

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export proxy="http://172.21.15.197:2080"
export http_proxy=$proxy
export https_proxy=$proxy
export ftp_proxy=$proxy
export no_proxy="localhost, 127.0.0.1, ::1, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8"
echo 'Acquire::http::Proxy "http://172.21.15.197:2080/";\nAcquire::https::Proxy "http://172.21.15.197:2080/";' | sudo tee -a /etc/apt/apt.conf.d/proxy.conf