1,When I run roscore, the output is like below, what does it mean? And it seems I didn't install my fuerte correctly,right? 2,When I install fuerte on my ubuntu12.04 it shows" ldconfig deferred processing now taking place",what does that mean?

asctec@asctec-mastermind:~/fuerteworkspace/sandbox/beginnertutorials$ roscore WARNING: unable to configure logging. No log files will be generated Checking log directory for disk usage. This may take awhile. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

Traceback (most recent call last): File "/opt/ros/fuerte/bin/rosversion", line 4, in import pkgresources File "/usr/lib/python2.7/dist-packages/pkgresources.py", line 2711, in parserequirements(requires), Environment() File "/usr/lib/python2.7/dist-packages/pkgresources.py", line 584, in resolve raise DistributionNotFound(req) pkg_resources.DistributionNotFound: rospkg==1.0.2 Invalid tag: Cannot load command parameter [rosversion]: command [rosversion ros] returned with code [1].

Param xml is