KeePass looks for some resources (XSL files) in the executable directory,
however under UNIX system this not a good idea, so we look into the
CommonApplicationData SpecialFolder, which usually maps to "/usr/share/".
So the final search path should be "/usr/share/KeePass/XSL/".

--- a/KeePass/forms/AboutForm.cs
+++ b/KeePass/Forms/AboutForm.cs
@@ -31,9 +31,11 @@
 using KeePass.Resources;
 using KeePass.UI;
 using KeePass.Util;
+using KeePass.Native;
 
 using KeePassLib;
 using KeePassLib.Utility;
+using KeePassLib.Native;
 
 namespace KeePass.Forms
 {
@@ -98,8 +100,21 @@
 			m_lvComponents.Items.Add(lvi);
 
 			lvi = new ListViewItem(KPRes.XslStylesheetsKdbx);
-			string strPath = WinUtil.GetExecutable();
-			strPath = UrlUtil.GetFileDirectory(strPath, true, false);
+
+			string strPath;
+			if (NativeLib.IsUnix())
+			{
+				strPath = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData);
+				strPath = UrlUtil.EnsureTerminatingSeparator(strPath, false);
+				strPath += PwDefs.ShortProductName.ToLower();
+				strPath = UrlUtil.EnsureTerminatingSeparator(strPath, false);
+			}
+			else
+			{
+				strPath = WinUtil.GetExecutable();
+				strPath = UrlUtil.GetFileDirectory(strPath, true, false);
+			}
+
 			strPath += AppDefs.XslFilesDir;
 			strPath = UrlUtil.EnsureTerminatingSeparator(strPath, false);
 			bool bInstalled = File.Exists(strPath + AppDefs.XslFileHtmlFull);