I recently upgraded to Mathematica 10.2, and there seem to be a problem with the help system. When typing

?Integrate

I get the following output

Integrate
System`
CreateUUID["Info-"]
False
False
False

(distributed over six cells). If I instead go to the menu, and chose

Help -> Wolfram Documentation

the help system works as usual. Any ideas about this? If it matters, I run ubuntu 15.04 and I had no problem with version 10.02. A screen shot is included below.