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@zzhou1 In some cases, ${ORG_VM} not totally using XXX/${ORG_VM}.qcow2 as the source file. For example, I'm gonna install a VM is sles15, but there is no operating system named sles15, only the sle15. After installing that, I changed the name because I really want to use sles15 as the VM name and I think the VM name can be changed casually.
According to the above, sudo ./virt-dup.sh -o sles15vm1 -n sles15vm2 --debug would get

/tmp/sles15vm1_dup_10148.xml is under processing for sles15vm2 
  <name>sles15vm1</name>
  <uuid>e65d76da-83bc-4cdb-baf5-c011c0d745b5</uuid>
      <mac address='52:54:00:44:0a:e0'/>
Stop, no result when search sles15vm1 in all image names

So, I propose the ${ORG_VM} as the source file name from named VM xml.

If there are some misunderstanding and mistakes I made, really appreciate to let me know.

Sincerely,
Yuan

--change-ip, the correct syntax need the comma ",". eg. eg. --change-ip ip1,ip2

tw:~ # virt-dup vm1 vm2 --change-ip 192.168.152.100,192.168.152.230

tw:~ # journalctl -f
...
Mar 24 16:48:25 tw systemd[1]: tmp-virt_dup_mnt_sfkqjzpy.k3s\x2dsle15sp2.mount: Succeeded.
Mar 24 16:48:33 tw kernel: block nbd0: NBD_DISCONNECT
Mar 24 16:48:33 tw kernel: block nbd0: Disconnected due to user request.
Mar 24 16:48:33 tw kernel: block nbd0: shutting down sockets
Mar 24 16:48:33 tw kernel: block nbd0: Attempted send on invalid socket
Mar 24 16:48:33 tw kernel: blk_update_request: I/O error, dev nbd0, sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 0

tw:~ # uname -r
5.9.11-1-default