On Thu, Oct 08, 2020 at 06:13:56PM -0000, sudodus wrote:
> Hi Thomas,

> I tried to make a minimal grub iso file, but failed. After installing
> xorriso too, I had the following error:

> $ sudo grub-mkrescue -o output.iso minimal
> grub-mkrescue: error: `mformat` invocation failed
> .

> I tried in an Ubuntu Groovy system. What is mformat? What should I add
> to make it work? Or would it be easy for you to upload a minimal iso
> somewhere, so that we (Leo and I) can download and test it?

mformat is from the mtools package, not installed by default.

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https://bugs.launchpad.net/bugs/1886148

Title:
  failure to boot groovy daily

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