Cannot install latest stable 4.2.1

I selected the default option during installation, and the system rebooted within a few seconds. However, just before rebooting, a red line flashed on the screen. I couldn’t read it as the screen disappeared very quickly, but I captured it on video and it definitely indicates a problem.

The message displayed was:
‘Media check is complete, the result is: FAIL
[FAILED] Failed to start checkisomd5@dev-sdc.service’

I found a similar issue reported on the Qubes OS forum that has been unresolved for the last 15 hours:

Could this issue be related to the ISO file? I have successfully created several USB drives with other operating systems and have never encountered a problem with the media created from an ISO image.