Seems like proprietary Nvidia driver is not there for your graphics card:
Kernel modules: nvidiafb, nouveau
** Also affects: nvidia-graphics-drivers (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to nvidia-graphics-drivers in Ubuntu.
https://bugs.launchpad.net/bugs/1806852
Title:
the 4.15.0.42 kernel causes a slower PC
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