Hi!
Thank you so much!
It already installed.
root@marcelo:~# apt search linux-headers-$(uname -r)
Sorting... Pronto
Full Text Search... Pronto
linux-headers-5.4.0-4-amd64/testing,unstable,now 5.4.19-1 amd64 [installed,automatic]
Header files for Linux 5.4.0-4-amd64
root@marcelo:~#
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Marcelo