This bug was closed in FAI 5.8.4. There's a Debian bug number: #925247 You are using an old version of FAI, so please update. If you are still using stretch, you can use the version from backports or from the fai-project.org repository.
> I'm preparing Debian Buster for use with fai, and I'm getting a very
> long delay for the installation when using LVM partition layout.
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regards Thomas
