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Finally I found the problem.
It was a library mismatch due to ${LD_LIBRARY_PATH} path order to find liblog4cxx.so.10 library.
I had another software that uses its own liblog4cxx.so.10 and includes it from another path that was preeminent in order. I found it executing:
ldd /opt/ros/melodic/lib/librosconsole_log4cxx.so
to see which libraries it is using, and I got that liblog4cxx.so.10 was not the /lib/x86_64-linux-gnu/liblog4cxx.so.10.
The solution is to change the path order in ${LD_LIBRARY_PATH}, or execute roscore as:
LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/:$LD_LIBRARY_PATH roscore
Problem solved.
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