Install Dolphin (EMU) developer edition on Ubuntu 20.04:
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You need the developer edition of the Dolphin wii/gamecube emulator to use vulkin graphics, that could help significantly on my Intel UHD 620 GPU.
You cant install this from the software repositories, and the official repo does not support Ubuntu versions released in 2019 or newer (as of April 2021) Such as my KDE Neon or Ubuntu 20.04 that it is based on. You have to make it from scratch.

0.Get preresuqters (18.04 or newer) *Update on June 2023 for qt6 support rather then qt5:
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sudo apt install --no-install-recommends ca-certificates qt6-base-dev qt6-base-private-dev libqt6svg6-dev git cmake make gcc g++ pkg-config libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libxi-dev libxrandr-dev libudev-dev libevdev-dev libsfml-dev libminiupnpc-dev libmbedtls-dev libcurl4-openssl-dev libhidapi-dev libsystemd-dev libbluetooth-dev libasound2-dev libpulse-dev libpugixml-dev libbz2-dev libzstd-dev liblzo2-dev libpng-dev libusb-1.0-0-dev gettext


1.Get dolphin master (devloper):
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sudo apt install git
git clone https://github.com/dolphin-emu/dolphin.git dolphin-emu-master
cd ./dolphin-emu-master

2.Build:
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git submodule update --init
*On my MSI2022 Laptop, may need to go to the "CMake" directory and delete the FindFFmpeg.cmake file since ffmpeg will cause dolphin build to fail at around the 100% (linking) mark (VAAPI ISSUE).
mkdir Build && cd Build
cmake ..
make -j$(nproc) -o2
sudo make install

Dolphin developer should now successful have been installed!
It should be an icon in KDE menu now.

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Sources:
https://wiki.dolphin-emu.org/index.php?title=Building_Dolphin_on_Linux
https://askubuntu.com/questions/1234080/dolphin-emulator-development-version
https://forums.dolphin-emu.org/Thread-building-from-source-cmake-fails-because-of-mgba-errors

Date: 2021 (for most of page)
Update: Jan 2022, added line to fix broken cmake.
Update: Feb 2023, Added line to fix ffmpeg breaking dolphin build on MSI2022.