“Failed to load Vulkan driver which is required to run the engine. the engine no longer fallbacks to OpenGL4 which has been deprecated” when I start UE4Editor in the Ubuntu 16.04
I wish I had seen this before. On Ubuntu, you must install Vulkan utils alongside Vulkan drivers:
$ sudo apt -y install vulkan-utils
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This is an old as hell thread, but it for some reason is the most visible on this issue when searching for this error message. I managed to find a fix. I personally run Debian 12 and started getting shown this message after upgrading from UE 5.5.4 to UE 5.6. I inspected the log files for information and found only this - that my graphics driver apparently doesn’t support Vulkan SM6 (also the vulkan SDK was empty for some reason idk):
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Display: Found VULKAN_SDK=
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Display: Registering provided Vulkan validation layers
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Display: Updated VK_LAYER_PATH=../../../Engine/Binaries/ThirdParty/Vulkan/Linux
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Display: Updated LD_LIBRARY_PATH=../../../Engine/Binaries/ThirdParty/Vulkan/Linux
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Display: Installed Vulkan Loader Path: /lib/x86_64-linux-gnu
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Display: Installed Vulkan Loader instance version 1.3.239.
[2025.06.18-22.57.55:060][ 0]LogVulkanRHI: Starting Vulkan Profile check for VP_UE_Vulkan_SM6:
[2025.06.18-22.57.55:083][ 0]LogVulkanRHI: Warning: None of the 1 devices meet all the criteria!
[2025.06.18-22.57.55:084][ 0]LogVulkanRHI: Vulkan Profile check complete.
[2025.06.18-22.57.55:084][ 0]LogRHI: Display: Opening shared memory
Now, that’s completely incorrect - I own a GeForce RTX 4070 and I know my graphics driver supports Vulkan SM6 because I was using it in UE 5.5.4, leading to this love letter of a forum post I’m making now about my upgrading experience. Nevertheless, it turned out that apparently the latest Nvidia drivers available via the package store aren’t quite latest enough for UE 5.6.
What I did to fix this is not clean. I don’t care, I just wanna make my game. Follow at your own risk.
I fixed this issue by purging my Nvidia drivers i got from the package store and then installing the latest driver version available on the Nvidia homepage.
# Run this command using superuser privileges (you can swap to it by typing su if you're new to this)
apt purge "*nvidia*"
After you’ve selected and downloaded the drivers for your hardware, just follow the instructions to install on the website, you can find them like this:
During install of the drivers, like 4 errors were reported to me. I ignored all of them, then my system restarted and everything worked again. Linux is one hell of an experience sometimes, man.
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