Ubuntu – How to switch to nvidia driver Ubuntu 18.04


I have Ubuntu 18.04 on Dell Vostro 15 – 3546.

uname -a

Linux <device-name> 4.15.0-117-generic #118-Ubuntu SMP Fri Sep 4 20:02:41 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux 

x86_64 x86_64 GNU/Linux
I recently had a problem where boot was stuck. So I added nomodeset in /etc/default/grub.
Now my screen flickers sometimes. Now, I want to follow this answer and fix the problem by switching to nVidia drivers.
As I am not so experienced in these things, so can you please tell me that do I have nVidia card/chip? If yes, then how do I switch to that?

ubuntu-drivers devices

== /sys/devices/pci0000:00/0000:00:1c.2/0000:06:00.0 ==
modalias : pci:v0000168Cd00000036sv00001028sd0000020Cbc02sc80i00
vendor   : Qualcomm Atheros
model    : QCA9565 / AR9565 Wireless Network Adapter
driver   : wireless-dw1707-precise-all-dkms - third-party free

== /sys/devices/virtual/dmi/id ==
modalias : dmi:bvnDellInc.:bvrA03:bd05/27/2014:svnDellInc.:pnVostro3546:pvrNotSpecified:rvnDellInc.:rn09XY3N:rvrA03:cvnDellInc.:ct8:cvrNotSpecified:
driver   : workaround-screen-lock-malfunction - third-party free
lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])

Thank in advance

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