Add compiling instructions for Ubuntu.

README.md

 
     rustup target add thumbv6m-none-eabi
 
-Compiling the base station software depends on the targeted board. The following steps can be used to cross-compile the software for an ARMv7 target from a Fedora host:
+Compiling the base station software depends on the targeted board. The following steps can be used to cross-compile the software for an ARMv7 target running Armbian from a Fedora host:
 
 1. Install the toolchain:
 
 
 2. Configure Rust to use the ARM GCC:
 
-        cat > ~/.cargo/config
+        cat > ~/.cargo/config <<_EOF
         [target.arm-unknown-linux-gnueabi]
         linker = "arm-linux-gnueabi-gcc"
+        rustflags = ["-Clink-args=-Wl,--dynamic-linker=/lib/ld-linux-armhf.so.3"]
+        _EOF
 
 3. Compile the software using the newly installed toolchain:
 
         cargo build --target=arm-unknown-linux-gnueabi
 
+For an Ubuntu host, the following steps can be used:
+
+1. Install the toolchain:
+
+        sudo apt-get install gcc-arm-linux-gnueabihf
+        rustup target add arm-unknown-linux-gnueabihf
+
+2. Configure Rust to use the ARM GCC:
+
+        cat > ~/.cargo/config <<_EOF
+        [target.arm-unknown-linux-gnueabihf]
+        linker = "arm-linux-gnueabihf-gcc"
+        _EOF
+
+3. Compile the software using the newly installed toolchain:
+
+        cargo build --target=arm-unknown-linux-gnueabihf
+
 # License
 
 The hardware contained in this repository is licensed under the [CERN Open Hardware Licence Version 2 - Weakly Reciprocal](cern_ohl_w_v2.txt), and the software is licensed under the [GNU General Public License v3](gpl-3.0.md).