Monitor Display Resolution settings incorrect in Zorin OS

Resolution of my Desktop Monitor is 1680x1050 but it shows only 1024x768. How to set it to correct resolution?

First we need some info, open the terminal and type;

sudo apt install  inxi
inxi -G
sudo xrandr

Setting up lm-sensors (1:3.4.0-4) ...
Created symlink /etc/systemd/system/ → /lib/systemd/system/lm-sensors.service.
Setting up inxi (2.3.56-1) ...
Setting up net-tools (1.60+git20161116.90da8a0-1ubuntu1) ...
Setting up mesa-utils (8.4.0-1) ...
Processing triggers for systemd (237-3ubuntu10.53) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for ureadahead (0.100.0-21) ...
bksingh@HareKrishna:~$ inxi -G
Graphics: Card: Advanced Micro Devices [AMD/ATI] Richland [Radeon HD 8470D]
Display Server: x11 (X.Org 1.20.8 )
drivers: fbdev,ati (unloaded: modesetting,vesa,radeon)
Resolution: 1024x768@76.00hz
OpenGL: renderer: llvmpipe (LLVM 10.0.0, 128 bits)
version: 3.3 Mesa 20.0.8
bksingh@HareKrishna:~$ sudo xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
1024x768 76.00*

Okay, let's first update the driver

sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt update && sudo apt -y upgrade


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