Building a deb with the latest release (2.9.5) I get the following error:

Unhandled rejection Error: Command failed: gm convert: Unable to open file (/tmp/electron-builder-30935NzzLT2KzUll7/icon_128x128x32.png) [No such file or directory].

I have provided a build/icon.icns file (generated using these steps: http://blog.macsales.com/28492-create-your-own-custom-icons-in-10-7-5-or-later). When I look what's in the /tmp/electron-builder-30935NzzLT2KzUll7/ folder, I see that it created the following icons:

icon_16x16x32.png
icon_256x256x32.png
icon_32x32x32.png
icon_512x512x32.png

Looks like 64 and 128 is missing.

I am building the linux deb from an Ubuntu 15.10 machine.

Any ideas what's going on? Alternatively, could I just provide the icons "manually" (I already have all those pngs anyways)?