pxfw software package provides Plextor firmware updater, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install pxfw
pxfw is installed in your system.
Make ensure the pxfw package were installed using the commands given below,
$ sudo dpkg-query -l | grep pxfw *
You will get with pxfw package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Other OSs and file systems |
| Package | pxfw |
| Version | 0.7.1.002-6 |
| Description | Plextor firmware updater |
| Sub Section | otherosfs |