I don't use Ubuntu, so I don't know if Ubuntu can mount/read OpenBSD drives, but I would try to copy it on the OpenBSD USB flash drive, reboot with Ubuntu and try to mount the USB flash.
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ThinkPad W500 P8700 6GB HD3650 - faultry
ThinkStation P700 2x2620v3 32GB 1050ti 3xSSD 1xHDD
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