There is unfortunately no Linux software available that supports Liteon's proprietary labeltag feature; the native Linux version of Nero has been discontinued. It was announced on the official site that:

As of March 27, 2012, Nero Linux 4 and the technical support for the product (and its family including Nero Linux 3) is no longer available.

However, this version of Nero in fact never supported the labeltag feature, as was revealed when a technical support question was raised on the official forums.

The labeltag feature is unlikely to ever be in any native application, as the official word is that the source code 'won't be published' and the specifications of the technology won't be able to be obtained.

Nero 8 comes with the Liteon burner, but very few cd burning applications will work properly under Wine, so unfortunately there is no real way of using labeltag under Ubuntu.