Ubunutu 20 documentation

docs/developer-guide.md

@@ -50,7 +50,7 @@ $ tup --version                 # should be 0.7.5 or later
 $ python --version              # should be 3.7 or later
 ```
 
-#### Linux (Ubuntu)
+#### Linux (Ubuntu < 20.04)
 ```bash
 sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
 sudo apt-get update
@@ -59,6 +59,13 @@ sudo apt-get install openocd
 sudo add-apt-repository ppa:jonathonf/tup && sudo apt-get update && sudo apt-get install tup
 ```
 
+#### Linux (Ubuntu >= 20.04)
+```bash
+sudo apt install gcc-arm-embedded
+sudo apt install openocd
+sudo apt install tup
+```
+
 #### Arch Linux
 ```bash
 sudo pacman -S arm-none-eabi-gcc arm-none-eabi-binutils
@@ -119,6 +126,8 @@ You can also modify the compile-time defaults for all `.config` parameters. You
 2. Connect the ODrive via USB and power it up.
 3. Flash the firmware using [odrivetool dfu](odrivetool#device-firmware-update).
 
+If you get `/bin/sh: 1: python: not found` while running `make`, change the tup file command to use `python3` 
+
 ### Flashing using an STLink/v2 programmer
 
 * Connect `GND`, `SWD`, and `SWC` on connector J2 to the programmer. Note: Always plug in `GND` first!