Upgraded packages that require a restart

[R Kimber]

Is there a definitive list somewhere that shows which packages, when
upgraded, require you to restart the computer?  Long ago, it used to be just
the kernel, but now it seems to embrace various packages.  It would help if
the upgrade manager announced clearly, before you upgrade, that a restart is
required if you go ahead, but it doesn't.

If there isn't a webpage somewhere, maybe it would be useful if this list
compiled one (?).  I'm guessing, but a start might be:

kernel
dbus
libc6
openssl

- Richard.
-- 
Richard Kimber
Political Science Resources
http://www.PoliticsResources.net/