docs: add wl-clipboard installation instructions

README.md

@@ -53,6 +53,9 @@ On Linux, clipboard support requires:
   - Arch Linux: `pacman -S xclip`
   - Fedora: `dnf install xclip`
 - `wl-clipboard` for Wayland.
+  - Ubuntu: `apt install wl-clipboard`
+  - Arch Linux: `pacman -S wl-clipboard`
+  - Fedora: `dnf install wl-clipboard`
 
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