bugs - No help from ?-command

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.

Answer

This is a bug in the paclet manager, which can cause the autoloading for certain system symbols to stop working (in this case, CreateUUID malfunctioned, also breaking Information which uses it).

The problem has already been fixed in the development version. For now, the recommended workaround is to delete the $UserBasePacletsDirectory, which is typically located in ~/.Mathematica/Paclets on Linux.