diff --git a/ch34x.c b/ch34x.c
index b640a73..dd08001 100644
--- a/ch34x.c
+++ b/ch34x.c
@@ -399,7 +399,7 @@ static int ch34x_get_baud_rate( unsigned int baud_rate,
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27))
 static void ch34x_set_termios( struct tty_struct *tty,
-		struct usb_serial_port *port, const struct ktermios *old_termios )
+		struct usb_serial_port *port, struct ktermios *old_termios )
 {
 #else
 static void ch34x_set_termios( struct usb_serial_port *port,
diff --git a/ubuntu.md b/ubuntu.md
new file mode 100644
index 0000000..6021f9f
--- /dev/null
+++ b/ubuntu.md
@@ -0,0 +1,35 @@
+# 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
+```