I just had this very same thing happening to me (Galaxy S5 with heimdall v.1.4.1, same error message).
This bug has been fixed upstream over a year ago. Could we please have an NMU for version 1.4.2 of heimdall? https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=872788 BTW: The author moved the heimdall repo https://gitlab.com/BenjaminDobell/Heimdall Greetings Jack
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