What do I need to install Flotilla and Rockpool on Ubuntu?

Excellent.

I have progress to report.

Deleted everything Flotilla related.

Followed Gadgetoid's script above.

Built libserialport and them moved it as you suggested.

Built websocketpp

Built the flotilla-daemon under ~/flotilla-daemon-vs

Started it OK using ~/flotilla-daemon-vs/Flotilla/Debug$ ./flotilla -d and got the friendly message 'Flotilla ready to set sail'.

Then got heap of:

Warning: Failed to open port /dev/ttyACM0

messages which I know is because the dock firmware needs updating.

Tried to update the dock firmware using '~/flotilla-pre/linux$ sudo ./update_firmware' and got the following:

Flotilla Firmware Updater
dock firmware file found

This update will break compatibility with older versions of flotillad
and change your Dock's serial baud rate to 115200
Press CTRL+C now if you're not sure, otherwise... enjoy!

./update_firmware: 29: read: Illegal option -s

Please unplug your Flotilla Dock!
Plug in your Flotilla Dock now.
Updating should continue automatically.

Bus 001 Device 008: ID 03eb:2fe4 Atmel Corp. ATxmega32A4U DFU bootloader
./firmware/dfu-programmer: error while loading shared libraries: libusb-1.0.so.0: cannot open shared object file: No such file or directory
./firmware/dfu-programmer: error while loading shared libraries: libusb-1.0.so.0: cannot open shared object file: No such file or directory
Update finished, enjoy!
Please unplug/replug your Flotilla Dock before use!

So, I'm guessing that I need libusb, so installed:
sudo apt-get install libusb-1.0-0-dev

And tried to update the dock again and got the same message as above.

The good news is that Rockpool launches and I can see my IP and the message 'No docks connected!' which is an improvement.

Thanks for the help so far.