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How to run Undertale on Manjaro (Linux)
By ErrantOverflow
Having issues when trying to run the native Linux version of Undertale on Manjaro? This might help you run the game
   
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Created by
ErrantOverflow
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Category: Modding or Configuration
Languages: English
Posted
31 Jul, 2021 @ 4:14pm
110 Unique Visitors
2 Current Favorites
Guide Index
Overview
Installing the missing libraries 
Defining your primary monitor 
Still crashing? 
If everything else fails, use Proton! 
Comments
Installing the missing libraries
The most likely thing that is making your game crash is that you don't have the following libraries installed:
Well, don't worry, you can install them with the following command using pacman
sudo pacman -S openssl-1.0 lib32-openssl-1.0
Defining your primary monitor
If the game is still crashing on startup, it might be because you don't have your primary monitor defined. To do so, we first need to know the name of your monitor:

$ xrandr Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767 DP-0 disconnected (normal left inverted right x axis y axis) DP-1 disconnected (normal left inverted right x axis y axis) HDMI-0 disconnected (normal left inverted right x axis y axis) eDP-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm 1920x1080 120.04*+ 48.01

After that, we simply input the following line on the console:
xrandr --output [MONITOR NAME] --primary

In my case, it should look like this:
xrandr --output eDP-1-1 --primary
Still crashing?
If all of the fixed above don't work, you can try to add one of the following startup commands to your game:

R600_DEBUG=mono %command%
or
R600_DEBUG=check_vm

If you don't know how to add a startup command, it's very simple. All you have to do is go to your steam game, right click on it, and go to it's properties:


Then, paste the code right below "Launch options"

If everything else fails, use Proton!
Last but not least, you can use trusty Proton! To do so, we first need to enable Steam Play for all titles if you haven't already:

Go to Steam > Settings > Steam Play, and on the advanced section, mark "Enable Steam Play for all other titles". This will force Steam to restart.



After that, we once again go to our game properties, and under the COMPATIBILITY tab, we first check "Force the use of a specific Steam Play compatibility tool" and then we choose our proton version.


If you are still having issues with Proton, then the best thing to do is to look for help on ProtonDB[www.protondb.com]