Update README.md

Help instruction for xcb issue on linux
NIRALUser · Jan 5, 2024 · 2d41222 · 2d41222
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@@ -42,6 +42,8 @@ pip install NeuroRuler
 
 If `python` or `pip` don't work, try `python3` and `pip3`.
 
+On Linux, please make sure that you have xcb, xcb-util, and xcb-util-cursor packages installed on your system. NeuroRuler further needs a QT6 installation (either user or system).
+
 ## Usage
 
 Download the latest [release](https://github.com/NIRALUser/NeuroRuler/releases).