I had exactly the same problem, but I found this bug report - 
https://bugs.launchpad.net/ubuntu/+source/backuppc/+bug/782890

It appears that BackupPC under Ubuntu 11.04 has started to use IPv6 when 
pinging localhost. The problem with this is that the 'Ping6Path' variable 
within my config.pl is not defined, so BackupPC is failing to successfully ping 
localhost. 

The solution is to simply add the following to config.pl: 

$Conf{Ping6Path} = '/bin/ping6'; undefined


Hope this helps.

Regards,

Bryce

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