I just upgraded Ubuntu to 18.04 from 16.04. My screen resolution is now stuck at 1280 x 1024, and xrandr shows:

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
VGA-1 connected primary 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024     60.02*+  75.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   640x480       75.00    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)

I normally have a much higher screen resolution.

I am not sure, but I may have had the restricted drivers installed before the upgrade... When I attempt to install Additional Drivers, I see this dialog, which doesn't seem right:

Additional Drivers

What might have gone wrong, and how I fix it?

My question is similar to After upgrading to 12.04, my screen resolution is small , but I do not understand the given answer...

What does "open Restricted Drivers again" means? I restarted and tried: same as above.

The solution seems to have been to re-install... And if I want to re-install, what is the simplest way (without having to build a boot disk and all)?

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