Dual monitor: Kubuntu 20.04 VGA monitor low resolution

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I have a dual monitor setup on Kubuntu 20.4, primary on DP secondary on VGA. I am unable to increase the resolution of the secondary monitor, the maximum it allows is 1024×768; however, the monitor supports upto 1366×768. I have checked various forums with similar issues, but didn’t help.
I am also unable to locate the proper xorg.conf file.
locate xorg.conf

The xrandr output is below:
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 16384 x 16384
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 1920×1080+1024+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920×1080 60.00*+
1600×900 60.00
1280×1024 75.02 60.02
1152×864 75.00
1024×768 75.03 60.00
800×600 75.00 60.32
640×480 75.00 59.94
720×400 70.08
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-3 connected 1024×768+0+312 (normal left inverted right x axis y axis) 0mm x 0mm
1024×768 60.00*
800×600 60.32 56.25
848×480 60.00
640×480 59.94

Has anyone faced something similar? any suggestions please, thank you.
It seems I did not search enough, this issue was solved about 9 years back, and I was avoiding checking solutions that old, but this worked.
Here are the steps:

Run xrandr to get the display name as shown above, mine is DP-3

Run cvt to get mode details of the display resolution you need

$ cvt 1366 768
# 1368×768 59.88 Hz (CVT) hsync: 47.79 kHz; pclk: 85.25 MHz
Modeline “1368x768_60.00” 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync

Add a new mode with the above details

$ xrandr –newmode “1368x768_60.00” 85.25 1368 1440 1576 1784 768
771 781 798 -hsync +vsync

Add the mode to the list of displays

$ xrandr –addmode DP-3 1368x768_60.00

Select the new resolution for your monitor from System Settings–>Display and Monitor–>Display configuration

Hope this helps someone who was not able to reach the original post.
Please click on this link for the original solution
I am still unable to find the xorg.conf file though.

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