Upgrading to kernel 4.18.0-21 HWE and updated Xorg server

[Chris]

I'm thinking about upgrading to the above kernel but would like to make
sure that with the updated Xorg server and other Xorg files. Will I
have any issues if I have to drop back to the current 4.15 kernel?

This is a Dell Optiplex 780. If more information is needed just let me
know please.

-- 
Chris
31.11972; -97.90167 (Elev. 1092 ft)
16:47:59 up 37 min, 1 user, load average: 0.78, 0.80, 1.08
Description:	Ubuntu 18.04.2 LTS, kernel 4.15.0-51-generic