If you search this forum on the message (returned 255, status 255) I suspect you will find a few references. The message appears after installing via the GUI, but does not always mean that the install failed. Try to use it as intended and see if it works.
Alternatively try connecting via SSH and doing:
opkg update
opkg install [packages]
Please let us know how this works and take a few minutes to write up the config. Also include any special notes on the client config if appropriate. Printer discovery may not be straight forward. This is an excellent use of the USB function and not one that is often discussed.