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From: John Hupp <grub-dev@prpcompany.com>
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Subject: Re: Grub2 theme error: "png: interlace method not supported"
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On 5/22/2014 1:32 PM, Chris Jones wrote:
> On Wed, May 21, 2014 at 06:14:42PM EDT, John Hupp wrote:
>
>> I'm trying to design a theme, and I'm using a certain png file for
>> both desktop-image and GRUB_BACKGROUND.  After I update-grub and
>> reboot, I get error: png: interlace method not supported.
> [...]
>
> Open the png in the Gimp and "export" (file menu) it to whatever.png.
> You will be presented with a popup with "advanced options". Uncheck
> "progressive" before clicking "Export".
>
> If I understand the message correctly this should solve your problem.
>
> CJ
>
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> Grub-devel mailing list
> Grub-devel@gnu.org
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Exporting to a png without interlacing solved the problem.  Thanks for 
the help!