My mistake, you are using the stable Debian:
you may replace the buster-backports by  bullseye-backports
Jerome

On 22/10/2021 11:47, Jerome BENOIT wrote:
Hi Lina,
your Debian is actually the old-stable (Buster).
You may consider to upgrade to the new stable (Bullseye)
since you seem to use recent hardware.
Jerome

On 22/10/2021 11:38, lina wrote:
Hi Andrew,

#------------------------------------------------------------------------------#
#                   OFFICIAL DEBIAN REPOS
#------------------------------------------------------------------------------#

###### Debian Main Repos
deb http://deb.debian.org/debian/ <http://deb.debian.org/debian/> stable main 
contrib non-free
deb-src http://deb.debian.org/debian/ <http://deb.debian.org/debian/> stable 
main contrib non-free

deb http://deb.debian.org/debian/ <http://deb.debian.org/debian/> 
stable-updates main contrib non-free
deb-src http://deb.debian.org/debian/ <http://deb.debian.org/debian/> 
stable-updates main contrib non-free

deb http://deb.debian.org/debian-security 
<http://deb.debian.org/debian-security> stable/updates main
deb-src http://deb.debian.org/debian-security 
<http://deb.debian.org/debian-security> stable/updates main

deb http://ftp.debian.org/debian <http://ftp.debian.org/debian> 
buster-backports main
deb-src http://ftp.debian.org/debian <http://ftp.debian.org/debian> 
buster-backports main

#------------------------------------------------------------------------------#
#                      UNOFFICIAL  REPOS
#------------------------------------------------------------------------------#

###### 3rd Party Binary Repos
###Debian Multimedia
deb [arch=amd64,i386] https://www.deb-multimedia.org 
<https://www.deb-multimedia.org> bullseye main non-free


I have just installed the firmware-misc-nonfree and
firmware-linux-nonfree and nvidia-driver.


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