NVIDIA GeForce GTX 260 trouble

[Wildcard]

I switched over from Linux Mint over to Debian 10 recently. I usually can troubleshoot through problems, but getting my old GTX 260 to work has left with some frustration. In the end my resolution always looks rather weird with very small text. This is dual monitor setup.

So how do I fix this? These are the commands I used.

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sudo nano /etc/apt/sources.list
(((This comes after and I add contrib and non-free)))
deb http://deb.debian.org/debian/ buster main contrib non-free
deb-src http://deb.debian.org/debian/ buster main contrib non-free

deb http://security.debian.org/debian-security buster/updates main contrib non-free
deb-src http://security.debian.org/debian-security buster/updates main contrib non-free

deb http://deb.debian.org/debian/ buster-updates main contrib non-free
deb-src http://deb.debian.org/debian/ buster-updates main contrib non-free

sudo apt update
sudo apt install nvidia-detect
sudo apt install nvidia-legacy-340xx-driver

[LE_746F6D617A7A69]

I switched over from Linux Mint over to Debian 10 recently. I usually can troubleshoot through problems, but getting my old GTX 260 to work has left with some frustration. In the end my resolution always looks rather weird with very small text. This is dual monitor setup.

Did You actually run the nvidia-detect? What does it show?
Most likely Your card is supported by the nvidia-driver package, and not only the outdated legacy version.

Besides, incorrect font size does not necessarily mean a problem with the driver - check the xorg.0.log.
What does it mean a "weird" resolution? - what is the native resolution of Your monitor vs what resolution is currently set?
Is the HW acceleration working? What about nVidia control panel?

After first boot the Nouveau driver was automatically used for this card - did You have any problems with the font sizes?

You've said that You can troubleshoot the problems, but You've failed to provide even most basic information...

[cuckooflew]

Example :

what is the native resolution of Your monitor vs what resolution is currently set?

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parrot$ xrandr
Screen 0: minimum 320 x 200, current 1440 x 900, maximum 8192 x 8192
VGA-1 connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 408mm x 255mm
   1440x900      59.89*+  74.98  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
parrot$