I've just bought a wireless combo keyboard + mouse, specifically Logitech mk270. Everything is working out-of-the-box, except for some multimedia keys, specifically the ones for the audio and the home one.
I've tried to configure it in the shortcut keyboard settings of ubuntu, when I assign volume mute to the proper key ubuntu indeed recognize that key and actually writes "Audio Mute" as key name. Same with volume up, volume down and Play/Pause.
Also, doing a the "System testing" ubuntu tool, the test says ok when I press those requested keys, so it's actually received by ubuntu.
Another interesting thing is that the home key is assigned by me in the shortcuts to open mi home folder, but it doesn't, it actually changes my current web page with my home-browser page. It looks like the keyboard doesn't care about what the system has defined to do with that keys and they do what the keyboard has defined them to do.
More info: assigning another key, like "Pause / Inter" for "Play/Pause" action or "Bloq Scroll" for "Mute Audio" action indeed work as expected.
EDIT: Curiously, same keyboard and mouse in another machine with the same system configuration: ubuntu 14.04 64 bits, it's working out-of-the-box...what's going on?
EXTRA: nano receiver came with this combo; but I'm realizing it's not compatible with Solaar package (my usb id is this: 046d:c534, not supported by Solaar) . Any work around for this?