Disable google desktop from my command

[effemmeffe]

I use a lot ubiqyuity to search selected text with google.
This is the sequence I was used to: select some text in a web page,
ctrl+space to open ubiqity, type g and press enter, ubiquity expand g
as google search command.
From some days ago, I can't figure out why, if I open the ubiquity
window and type g the command became google desktop search in my
computer and not google search.
I have to select google search every time and this is annoying.
I searched in my command list for some reference to google desktop,
but wasn't able to find anyting.
Some help, please?