something else came up after I typed roscore:

... logging to
/home/mars/.ros/log/10c0a87c-9bfb-11df-97f5-70f1a177b603/roslaunch-mars-laptop-13694.log

Unable to contact my own XML-RPC server, this is a highly unusual error and
should be reported immediately.
My URI is [http://192.168.1.108:51003/]
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