Download 2.4GB debootstick_buster_kde_lxqt_amd64_20210226_da.dd.tgz md5sum debootstick.sh
Use Rufus on Windows or on Linux: sudo dd if=debootstick_buster_kde_lxqt_amd64_20210226_da.dd of=/dev/sdX bs=10M status=progress ; sync
Run with kvm: kvm -ctrl-grab -m 4096 -vga virtio -soundhw all -hda debootstick_buster_kde_lxqt_amd64_20210226_da.dd
Run with VirtualBox: Copy and truncate it, then convert to vmdk with "cp debootstick_buster_kde_lxqt_amd64_20210226_da.dd debootstick_buster_kde_lxqt_amd64_20210226_da_16gb.dd; truncate -s 16GB debootstick_buster_kde_lxqt_amd64_20210226_da_16gb.dd; VBoxManage internalcommands createrawvmdk -filename debootstick_buster_kde_lxqt_amd64_20210226_da_16gb.dd -rawdisk debootstick_buster_kde_lxqt_amd64_20210226_da_16gb.vmdk"