Disable the 'install' button for the Linux runner.

You probably don't need to do this.

lutris/gui/config/runner_box.py

@@ -80,6 +80,7 @@ class RunnerBox(Gtk.Box):
                 _button = Gtk.Button.new_from_icon_name("system-software-install-symbolic", Gtk.IconSize.BUTTON)
                 _button.get_style_context().add_class("circular")
                 _button.connect("clicked", self.on_install_clicked)
+                _button.set_sensitive(not self.runner.is_installed())
         _button.show()
         return _button
 

lutris/runners/linux.py

@@ -3,6 +3,7 @@
 import os
 import stat
 from gettext import gettext as _
+from typing import Callable
 
 # Lutris Modules
 from lutris.exceptions import GameConfigError, MissingExecutableError
@@ -126,6 +127,12 @@ class linux(Runner):
         """Well of course Linux is installed, you're using Linux right ?"""
         return True
 
+    def can_uninstall(self):
+        return False
+
+    def uninstall(self, uninstall_callback: Callable[[], None]) -> None:
+        raise RuntimeError("Linux shouldn't be installed.")
+
     def get_launch_config_command(self, gameplay_info, launch_config):
         # The linux runner has no command (by default) beyond the 'exe' itself;
         # so the command in gameplay_info is discarded.