UndertaleModTool Unix Installer

April 12, 2026 · View on GitHub

Unofficial UndertaleModTool GUI installer for Linux and macOS via Wine.

Install or Update

Just one command:

curl -sL https://raw.githubusercontent.com/YarTom/UndertaleModTool-linux-installer/main/install.sh | $(echo \$0)

macos

kde

Usage

After installation:

  • From applications menu → UndertaleModTool
  • Or via terminal: 
    ~/.wine_undertalemodtool/UndertaleModTool.sh [path_to_file]
  • If you chose to create aliases: 
    UndertaleModTool [path_to_file]
    or simply: 
    utmt [path_to_file]

Uninstall

curl -sL https://raw.githubusercontent.com/YarTom/UndertaleModTool-linux-installer/main/uninstall.sh | $(echo \$0)

About

I have been using UndertaleModTool via wine on Linux for a long time and encountered the same issues many times.

The goal of this project is to create a unified way to install UndertaleModTool GUI for Linux, solving common issues until UTMT migrates to a framework with native Linux support.

Features

  • Automatically changes DPI in a separate Wine prefix for UTMT (scales up the UI)
  • Automatically installs Wine (if necessary)
  • You select the version (Stable or Nightly) for automatic installation
  • Creates a desktop menu entry
  • Creates 'utmt' and 'UndertaleModTool' aliases for easy terminal access (optional)

Requirements

  • curl, unzip

Tested On

  • Linux Mint 22.2

  • Fedora 43

  • MacOS Big Sur 11.7.11

You can open a pull request and add your distribution here if the script works for you.

Troubleshooting

If you have problems with script execution, try to run it with bash explicitly:

curl -sL https://raw.githubusercontent.com/YarTom/UndertaleModTool-linux-installer/main/install.sh | bash

or on macOS:

curl -sL https://raw.githubusercontent.com/YarTom/UndertaleModTool-linux-installer/main/install.sh | zsh

Fixed Issues

Graphical Artifacts

Issues with context menu rendering and other graphical artifacts. Artifacts

Fixed by automatically adding:

WINEDLLOVERRIDES="d3d9=d;d3d10=d;d3d11=d

to launch parameters. This disables hardware acceleration for graphics, which removes the artifacts.

Crash When Trying to Open Code

Fixed by automatically installing required fonts into the Wine prefix:

winetricks corefonts

Issues with Save File Paths

Fixed by adding special path handling in the launch script. For details, refer to the launch script: ~/.wine_undertalemodtool/UndertaleModTool.sh

Reporting Issues

When creating a bug report, please include:

  • Your Linux distribution
  • Hardware configuration (CPU, GPU, RAM)
  • Wine/Proton version
  • Relevant log output

Create an issue: GitHub Issues