"electron-builder": "19.27.7"
Related issue: https://github.com/gengjiawen/desktop/issues/14.
Repro repo: https://github.com/gengjiawen/desktop.
On my Ubuntu 16.04, the issue also exists (using AppImage https://github.com/gengjiawen/desktop/releases), it this a bug or Do i miss something ? Thanks.

I lost icon in Ubuntu 16.04 too.
My electron-builder configuration and version (18.6.2) did not changed.
I also tried with the last electron-builder version.
I tried both icon generated from icns and 32x32.png.
I can confirm this bug.
"electron": "^1.7.8",
"electron-builder": "^19.33.0",
Is it still an issue?
Yes, it still exist.
@gengjiawen Set the icon option to the BrowserWindow will fix this problem.

@Molunerfinn Thanks, I will take a look.
This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
Most helpful comment
Yes, it still exist.