Kind of works

README.md

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+# Prerequisites
+
+```
+apt install -y e2fsprogs coreutils debootstrap qemu-system-x86
+```
+
+
+# Create vm
+```
+sudo ./create-vm.sh
+
+```
+
+# Run firefox
+Start vm
+```
+qemu-system-x86_64 \
+    -drive file=root.img,format=raw \
+    -kernel /boot/vmlinuz-`uname -r` \
+    -initrd  /boot/initrd.img-`uname -r` \
+    -append "root=/dev/sda rdinit=/sbin/init console=tty1,115200 console=ttyS0,115200" \
+    -m $MEMORY \
+    -smp ${CPU:-1} \
+    -machine ubuntu,accel=kvm \
+    -nographic \
+    -device virtio-net,netdev=vmnic -netdev user,id=vmnic,hostfwd=tcp::5555-:22
+```
+Run firefox
+```
+ssh user@localhost -p5555 -Y firefox
+```

create-vm.sh

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+#!/bin/bash
+
+DISK=3G
+MEMORY=2G
+CPU=4
+
+truncate root.img --size ${DISK:-3G}
+mkfs.ext4 root.img -L ROOT
+
+export MOUNTPOINT=$(mktemp -d)
+mount root.img $MOUNTPOINT
+debootstrap --include=firefox,openssh-server,xauth --components=main,universe bionic $MOUNTPOINT
+cat <<"EOF" | bash
+chroot $MOUNTPOINT
+useradd -m user
+passwd -d user
+echo LABEL=ROOT / ext4 rw 0 1 > /etc/fstab
+echo "user   ALL=(ALL:ALL) NOPASSWD: ALL" >> /etc/sudoers
+
+cat<<"EOF2" > /etc/systemd/system/dhclient.service
+[Unit]
+Description=dhclient
+#After=network.target
+
+[Service]
+Type=simple
+ExecStart=/bin/bash -c 'modprobe virtio-net; while [[ ! $( ip l | grep -e "^2:") ]]; do sleep 1; done; /sbin/dhclient -v -w'
+StandardOutput=journal
+
+[Install]
+WantedBy=multi-user.target
+EOF2
+systemctl enable dhclient
+
+EOF
+
+# apt doesn't find it for some reason
+# sudo apt-get -o Dir=$MOUNTPOINT update
+# sudo apt-get -o Dir=$MOUNTPOINT install linux-modules-`uname -r`
+mkdir $MOUNTPOINT/lib/modules/
+cp /lib/modules/`uname -r` $MOUNTPOINT/lib/modules/ -r
+umount $MOUNTPOINT