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Boryeu Mao:
> For the template install command on Qubes release 4.2.3
> 
>    sudo qubes-dom0-update qubes-template-fedora-40-minimal
> 
> I received a message that
> 
>    fstrim: /var/tmp/tmpsd1ns61v/var/lib/qubes/vm-template: the discard 
> operation is not supported

Did you maybe mount a tmpfs at /var/tmp? That would explain fstrim not
working. It also wouldn't matter then.

> The template appears to be running normally, so perhaps this is a warning 
> message.

Pretty much. The fstrim invocation was added to inform the underlying
storage (LVM Thin by default) of the filesystem hosting /var/tmp that
the space previously used for temporary image files extracted during
the installation process can be freed:

https://github.com/QubesOS/qubes-core-admin-client/commit/4a9b57f91fdf3a2b35a5cf707970d05bf9cadba7

But it doesn't affect the installed template.

Rusty
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