I got same error at update.
Following an hour the #ubuntu irc channel gives me the pointers to related bug reports:
how to got these message too?
open terminal and launch the Update Manager by typing update-manager
a first time i catch (The Dutch texts tells the actions it was performing):
user@Hostname:~$ update-manager
...some messages about some password verifying stuff...
Er wordt gecontroleerd of er een nieuwe Ubuntu-uitgave is
'saucy.tar.gz' tegen 'saucy.tar.gz.gpg' verifiëren
‘saucy.tar.gz’ wordt uitgepakt
Segmentation fault (core dumped)
A next try delivers:
user@Hostname:~$ update-manager
Er wordt gecontroleerd of er een nieuwe Ubuntu-uitgave is
Real-time signal 0
This last message is which is reported at the bug mentioned above too.
It seems related to the Nvidia driver too, a temporary solution is switching to the nouveau driver to do the update. But in #ubuntu it was suggested that it seems reasonable to expect a fix for this. So just wait..