Installed nvidia driver on ubuntu but it doesn't work, why?

Question

NVIDIA

Installed the Nvidia driver on the machine, but the computer still uses Intel® HD

Graphics 530 (Skylake GT2). 
Команда modinfo nvidia выводит:
filename:       /lib/modules/4.18.0-20-generic/updates/dkms/nvidia.ko
alias:          char-major-195-*
version:        430.14
supported:      external
license:        NVIDIA
srcversion:     7CC15950AB2B0F0117C7586
alias:          pci:v000010DEd00000E00sv*sd*bc04sc80i00*
alias:          pci:v000010DEd*sv*sd*bc03sc02i00*
alias:          pci:v000010DEd*sv*sd*bc03sc00i00*
depends:        ipmi_msghandler
retpoline:      Y
name:           nvidia
vermagic:       4.18.0-20-generic SMP mod_unload