Building Unreal Engine 5.7 blueprint project package for Windows under Linux (Ubuntu 24.04)

Source: Dev.to

Prerequisites

• Ubuntu 24.04 (or another recent Linux distribution)
• Unreal Engine 5.7 source code compiled for Linux (or the binary distribution)
• Umu/Proton for running Windows binaries under Wine
• Internet connection for downloading SDKs and tools

1. Set paths and create the AutoSDK directory

export UE_PATH=/Path/To/UE_5.7          # ← set this to your Unreal Engine directory
export MSVC_PATH=$UE_PATH/AutoSDK/HostWin64/Win64
mkdir -p "$MSVC_PATH"

2. Download the Windows SDK and Visual Studio Build Tools with msvc-wine

cd "$UE_PATH"
git pull https://github.com/mstorsjo/msvc-wine
cd msvc-wine
./vsdownload.py --accept-license \
    --major 17 \
    --dest "$MSVC_PATH" \
    --msvc-version 17.8 \
    --sdk-version 10.0.22621 \
    --architecture x64 \
    --host-arch x64
./install.sh "$MSVC_PATH"

3. Create the required symlink

ln -s "$MSVC_PATH/VC/Tools/MSVC" "$MSVC_PATH/VS2022"

4. Download GE‑Proton 10‑34

cd "$UE_PATH"
wget https://github.com/GloriousEggroll/proton-ge-custom/releases/download/GE-Proton10-34/GE-Proton10-34.tar.gz
tar -xzf GE-Proton10-34.tar.gz

5. Install the Umu launcher

wget https://github.com/Open-Wine-Components/umu-launcher/releases/download/1.4.0/umu-launcher_1.4.0-1_all_ubuntu-noble.deb
sudo apt install ./umu-launcher_1.4.0-1_all_ubuntu-noble.deb

6. Create a wrapper script ($UE_PATH/umu)

#!/usr/bin/env bash
set -euo pipefail

# Prevent some crashes on RTX GPUs
nvidia-settings -a "[gpu:0]/GPUPowerMizerMode=1"

# ==== USER SETTINGS ====
export UE_PATH="/Your/Path/To/UE_5.7"
export UE_SDKS_ROOT="z:\\Your\\Path\\To\\UE_5.7\\AutoSDK"

export PROTONPATH="$UE_PATH/GE-Proton10-34"
export WINEPREFIX="$UE_PATH/prefix"

# Additional stability tweaks
export DXVK_ASYNC=1
export PROTON_USE_XALIA=0
export DISABLE_LAYER_MESA_ANTI_LAG=1
export VKD3D_CONFIG=nodxr   # disable RayTracing

EXE="$1"
shift || true

mkdir -p "$WINEPREFIX"
exec umu-run "$EXE" "$@"

Make it executable:

chmod +x "$UE_PATH/umu"

7. Create an Unreal Engine launch script ($UE_PATH/start)

#!/usr/bin/env bash

# Use DX12 and disable RayTracing for better stability
./umu Engine/Binaries/Win64/UnrealEditor.exe -dx12 -NoRayTracing

chmod +x "$UE_PATH/start"

8. Building a Windows package from the command line

Why the editor packaging fails

Attempting to package directly from the UE editor on Linux often ends with an error similar to:

LogOutputDevice: Error: === Handled ensure: === 
...
BuildCookRunParams='-nop4 -utf8output -nocompileeditor -skipbuildeditor -cook ...

The issue stems from missing Windows‑specific build targets in the Linux environment.

Use the umu wrapper to run the Windows command prompt

cd "$UE_PATH"
./umu wineconsole cmd

Example RunUAT command

Replace the placeholders with your actual project paths:

set UE_PATH=Z:\Your\Path\To\UE_5.7
cd %UE_PATH%\Engine\Build\BatchFiles
RunUAT.bat BuildCookRun ^
    -nop4 ^
    -utf8output ^
    -project="%UE_PATH%\Projects\YourProject\YourProject.uproject" ^
    -unrealexe="%UE_PATH%\Engine\Binaries\Win64\UnrealEditor-Cmd.exe" ^
    -platform=Win64 ^
    -clientconfig=Development ^
    -serverconfig=Development ^
    -installed ^
    -nocompileeditor ^
    -skipbuildeditor ^
    -nobuild ^
    -cook ^
    -stage ^
    -package ^
    -pak ^
    -iostore ^
    -prereqs ^
    -archive ^
    -archivedirectory="%UE_PATH%\Projects\YourProject\Packaged\Win64"

Running the command inside the umu‑wrapped cmd will produce a packaged Windows build in:

Projects/YourProject/Packaged/Win64

Caveats

• UE 5.7 is still unstable on both native Linux and Windows‑under‑Proton. Crashes are common, so save frequently.
• Tweaking DefaultEngine.ini and DefaultEditor.ini may improve stability (e.g., disabling RayTracing, adjusting DX12 settings).