Create ubuntu.md

ubuntu.md

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+# Recipe for Ubuntu systems
+
+### Install dependencies:
+
+```bash
+apt install linux-headers-$(uname -r)
+```
+
+### Build and load / unload
+
+```bash
+make
+
+sudo make load
+
+ls /dev/ttyUSB*
+
+sudo make unload
+```
+
+### Troubleshooting
+
+If you see `usbfs: interface 0 claimed by ch34x while 'brltty' sets config #1` in `sudo demsg`:
+
+```bash
+for f in /usr/lib/udev/rules.d/*brltty*.rules; do
+    sudo ln -s /dev/null "/etc/udev/rules.d/$(basename "$f")";
+done
+
+sudo udevadm control --reload-rules
+
+sudo systemctl mask brltty.path
+
+sudo dmesg
+```