diff --git a/common_utils.py b/common_utils.py
index a6f78356..ce3c7986 100644
--- a/common_utils.py
+++ b/common_utils.py
@@ -29,23 +29,22 @@ def ensure_on_screen(self, parent: tk.Tk):
     :param self: The calling class instance of tk.TopLevel
     :param parent: The parent window
     """
-    if sys.platform != 'win32':
-        return
-    try:
-        # Get monitor info for the monitor containing the parent window
-        monitor = win32api.MonitorFromWindow(parent.winfo_id(), win32con.MONITOR_DEFAULTTONEAREST)
-        monitor_info = win32api.GetMonitorInfo(monitor)
-        work_area = monitor_info['Work']  # Gets the working area (excludes taskbar)
+    if sys.platform == 'win32':
+        try:
+            # Get monitor info for the monitor containing the parent window
+            monitor = win32api.MonitorFromWindow(parent.winfo_id(), win32con.MONITOR_DEFAULTTONEAREST)
+            monitor_info = win32api.GetMonitorInfo(monitor)
+            work_area = monitor_info['Work']  # Gets the working area (excludes taskbar)
 
-        # Calculate optimal position
-        x = max(work_area[0], min(parent.winfo_rootx(), work_area[2] - self.winfo_width()))
-        y = max(work_area[1], min(parent.winfo_rooty(), work_area[3] - self.winfo_height()))
+            # Calculate optimal position
+            x = max(work_area[0], min(parent.winfo_rootx(), work_area[2] - self.winfo_width()))
+            y = max(work_area[1], min(parent.winfo_rooty(), work_area[3] - self.winfo_height()))
 
-        # Update window position
-        self.geometry(f"+{x}+{y}")
+            # Update window position
+            self.geometry(f"+{x}+{y}")
 
-    except Exception as e:
-        logger.debug(f"Failed to ensure window is on screen: {e}")
+        except Exception as e:
+            logger.debug(f"Failed to ensure window is on screen: {e}")
 
 
 def log_locale(prefix: str) -> None:
diff --git a/config/linux.py b/config/linux.py
index 27e4d6bf..1b5ac924 100644
--- a/config/linux.py
+++ b/config/linux.py
@@ -75,7 +75,7 @@ class LinuxConfigMinimal:
 
     def close(self) -> None:
         """Release resources (stub)."""
-        self.config = None
+        del self.config
 
 
 def linux_helper(config: Config) -> Config:
diff --git a/myNotebook.py b/myNotebook.py
index 7098fad3..119f33bb 100644
--- a/myNotebook.py
+++ b/myNotebook.py
@@ -51,10 +51,18 @@ class Label(ttk.Label):
     """Custom ttk.Label class to fix some display issues."""
 
     def __init__(self, master: ttk.Frame | None = None, **kw):
-        kw['foreground'] = kw.pop('foreground', PAGEFG if sys.platform == 'win32'
-                                  else ttk.Style().lookup('TLabel', 'foreground'))
-        kw['background'] = kw.pop('background', PAGEBG if sys.platform == 'win32'
-                                  else ttk.Style().lookup('TLabel', 'background'))
+        if sys.platform == 'win32':
+            fg_color = PAGEFG
+        else:
+            fg_color = ttk.Style().lookup('TLabel', 'foreground')
+
+        if sys.platform == 'win32':
+            bg_color = PAGEBG
+        else:
+            bg_color = ttk.Style().lookup('TLabel', 'background')
+
+        kw['foreground'] = kw.pop('foreground', fg_color)
+        kw['background'] = kw.pop('background', bg_color)
         super().__init__(master, **kw)
 
 
diff --git a/prefs.py b/prefs.py
index f122b9e3..65feb24b 100644
--- a/prefs.py
+++ b/prefs.py
@@ -309,6 +309,11 @@ class PreferencesDialog(tk.Toplevel):
         self.cmdrchanged()
         self.themevarchanged()
 
+        # Init hotkey attributes to avoid linter errors
+        self.hotkey_text: ttk.Entry
+        self.hotkey_only_btn: nb.Checkbutton
+        self.hotkey_play_btn: nb.Checkbutton
+
         # disable hotkey for the duration
         hotkeymgr.unregister()
 
diff --git a/util_ships.py b/util_ships.py
index 8abbe20f..4f99e731 100644
--- a/util_ships.py
+++ b/util_ships.py
@@ -6,6 +6,7 @@ Licensed under the GNU General Public License.
 See LICENSE file.
 """
 import os
+import sys
 from pathlib import Path
 from edmc_data import ship_name_map
 
@@ -18,7 +19,7 @@ def ship_file_name(ship_name: str, ship_type: str) -> str:
     name = Path(name).with_suffix("").name
 
     # Check if the name is a reserved filename
-    if os.path.isreserved(name):
+    if sys.platform == 'win32' and os.path.isreserved(name):
         name += "_"
 
     return name.translate(