Do you still know whether you experienced that in the afternoon or evening? The log says
2010-03-30 15:02:47,107 DEBUG: Updating repository indexes... 2010-03-30 15:02:47,460 DEBUG: ... fail!
(but unfortunately not what went wrong) Given that it failed that quickly (in 0.3 s) I suspect that either apt was locked, or it determined very quickly that it couldn't get online. I have to add more verbosity here..
and then a couple of more failures
2010-03-30 20:20:48,749 DEBUG: Updating repository indexes... 2010-03-30 20:20:48,962 DEBUG: ... fail! 2010-03-30 20:20:48,995 DEBUG: Updating repository indexes... 2010-03-30 20:20:49,212 DEBUG: ... fail! 2010-03-30 20:20:49,241 DEBUG: Updating repository indexes... 2010-03-30 20:20:49,456 DEBUG: ... fail! 2010-03-30 20:20:49,490 DEBUG: Updating repository indexes... 2010-03-30 20:20:49,703 DEBUG: ... fail!
but finally: 2010-03-30 20:24:17,478 DEBUG: Updating repository indexes... 2010-03-30 20:26:16,191 DEBUG: ... success
but here the log ends, and it seems you didn't start it again after that?
Do you still know whether you experienced that in the afternoon or evening? The log says
2010-03-30 15:02:47,107 DEBUG: Updating repository indexes...
2010-03-30 15:02:47,460 DEBUG: ... fail!
(but unfortunately not what went wrong) Given that it failed that quickly (in 0.3 s) I suspect that either apt was locked, or it determined very quickly that it couldn't get online. I have to add more verbosity here..
and then a couple of more failures
2010-03-30 20:20:48,749 DEBUG: Updating repository indexes...
2010-03-30 20:20:48,962 DEBUG: ... fail!
2010-03-30 20:20:48,995 DEBUG: Updating repository indexes...
2010-03-30 20:20:49,212 DEBUG: ... fail!
2010-03-30 20:20:49,241 DEBUG: Updating repository indexes...
2010-03-30 20:20:49,456 DEBUG: ... fail!
2010-03-30 20:20:49,490 DEBUG: Updating repository indexes...
2010-03-30 20:20:49,703 DEBUG: ... fail!
but finally:
2010-03-30 20:24:17,478 DEBUG: Updating repository indexes...
2010-03-30 20:26:16,191 DEBUG: ... success
but here the log ends, and it seems you didn't start it again after that?