Created attachment 486562 [details] Fix return code failure with zero-valued arithmetic expression The new autoexit setting, set -e, caused a runtime error in the case of a zero value in the arithmetic expression command, ((tbd += <du value>)), that is when both tbd and the du value were 0. This occurs when the installation device is empty and there is no /syslinux directory to size. The attached patch changes the command to tdb=$((tbd + <du value>)), which fixes the problem because the assignment operation returns "SUCCESS".