Matt: check my bug report. This is not limited to the unity desktop environment. I have the same bug on kubuntu and Mint 14. In fact, I didn't put it in the bug report or investigte thoroughly, but seemed to have the same or a similar problem on a liveUSB of Manjaro linux which is Arch-based, and have seen similar bugs reported against Fedora and even Gentoo.
I suspect (though I do not have the technical knowledge to chase it down) there has been a regression in hpaio, or an inconsistency in what hplip expects from the recent alterations in the file structure or systemd.
Matt: check my bug report. This is not limited to the unity desktop environment. I have the same bug on kubuntu and Mint 14. In fact, I didn't put it in the bug report or investigte thoroughly, but seemed to have the same or a similar problem on a liveUSB of Manjaro linux which is Arch-based, and have seen similar bugs reported against Fedora and even Gentoo.
I suspect (though I do not have the technical knowledge to chase it down) there has been a regression in hpaio, or an inconsistency in what hplip expects from the recent alterations in the file structure or systemd.