Unable to install vulkan on ubuntu 20.04

Question

My GPU is NVIDIA GeForce GT 705. On running ./UE4Editor, the error says "Cannot find a compatibe Vulkan device or driver". So, I tried to install Vulkan following this page Vulkan On Linux . sudo add-apt-repository ppa:graphics-drivers/ppa and sudo apt upgrade are may be correct.

$ sudo ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
modalias : pci:v000010DEd0000104Csv00001028sd0000109Bbc03sc00i00
vendor   : NVIDIA Corporation
model    : GF119 [GeForce GT 705]
driver   : nvidia-340 - distro non-free
driver   : nvidia-driver-390 - distro non-free recommended
driver   : xserver-xorg-video-nouveau - distro free builtin

$ sudo add-apt-repository ppa:graphics-drivers/ppa
Hit:1 http://jp.archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://jp.archive.ubuntu.com/ubuntu focal-updates InRelease [107 kB]                             
Get:3 http://jp.archive.ubuntu.com/ubuntu focal-backports InRelease [98.3 kB]                                                          
Hit:4 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu focal InRelease                                                               
Get:5 http://security.ubuntu.com/ubuntu focal-security InRelease [107 kB]
Get:6 http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu focal InRelease [23.8 kB]
Get:7 http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu focal/main amd64 Packages [7,196 B]
Get:8 http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu focal/main i386 Packages [6,924 B]
Fetched 350 kB in 3s (128 kB/s)                     
Reading package lists... Done

but, below is error.

$ sudo apt install nvidia-graphics-drivers-396 nvidia-settings vulkan vulkan-utils
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package nvidia-graphics-drivers-396
E: Unable to locate package vulkan

I don't know why nvidia-graphics-drivers-396 and vulkan don't exist and how I install vulkan. Please tell me about it.

Answer 1

The GT 705 is based on the Fermi architecture, which simply does not support Vulkan. So even with a recent driver you won't be able to use Vulkan with that GPU.