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Subject: Grub2 theme error: "png: interlace method not supported"
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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.

Can someone explain to me what grub is objecting to?

I'm running Lubuntu 14.04.

(Hope this a good place to post this -- I didn't see a grub users lists, 
only the devs list.)