On 2016-01-20, Truth wrote:
> While everything was fine with my test-setup using Debian 8.2 (i386, 
> linux-3.16) ...
> I tried to install the same ltsp-pnp server on Debian 8.2 (using 
> linux-4.3 from the backports).

You'll need the backported LTSP packages from jessie-backports, and may
as well get updated LDM packages while you're at it.


> I tried to create an image with the command
>    ltsp-update-image --cleanup /
>
> and get the following error message:
>    modprobe: FATAL: Module overlayfs not found.
>    modprobe: FATAL: Module aufs not found.
>    No overlayfs or aufs support detected
>
> (I did not have this problem with linux-3.16.)
>
> Does someone has an idea what's wrong?

The issue is that 4.x kernels in jessie-backports don't have aufs
support, and the version of LTSP you are using doesn't have support for
the overlay fs included in the 4.x kernels (not to be confused with
overlayfs, which was shipped with ubuntu, but behaved somewhat
differently).

The newer versions of LTSP fix this issue, although required switching
to NBD rather than NFS, as overlay fs is incompatible:

  https://bugs.debian.org/786925


live well,
  vagrant

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