README: Add build dependencies installation instructions for Ubuntu

Tested on Ubuntu 25.10.

Signed-off-by: 林博仁(Buo-ren Lin) <buo.ren.lin@gmail.com>

Author: brlin-tw

README.md

@@ -168,6 +168,9 @@ sudo dnf install systemd-devel hidapi-devel
 
 # FreeBSD
 sudo pkg install rust hidapi pkgconf
+
+# Ubuntu
+sudo apt install cargo libhidapi-dev libsystemd-dev libudev-dev libusb-1.0-0-dev pkg-config rustc
 ```
 
 ```sh