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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.

Screen shot showing the problem

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    $\begingroup$ Try RebuildPacletData[]. $\endgroup$ – ilian Sep 7 '15 at 19:09
  • $\begingroup$ @ilian That indeed made it work. But after restart, I get the same problem again. $\endgroup$ – mickep Sep 7 '15 at 19:16
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    $\begingroup$ The next step would be to delete the ~/.Mathematica/Paclets directory. $\endgroup$ – ilian Sep 7 '15 at 19:18
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    $\begingroup$ @ilian Thanks! Now it continues to work after I restart Mathematica. I'm not sure what to do with the question. If you write an answer, I can accept it. $\endgroup$ – mickep Sep 7 '15 at 19:22
  • $\begingroup$ Since this is a confirmed bug I added the "bugs" tag. I removed the version 10.2 tag because 1) it is not clear whether it is related to this version and 2) we agreed that version information (if known) in bugs posts will be written in the post's header (see this Meta post) $\endgroup$ – Sjoerd C. de Vries Sep 7 '15 at 21:16
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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.

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