test on ubuntu 20.04 install libs

gcontini

2021-05-20 fd34cbaaa001647ee4918a33a535cb471a8b2545

 src/library/base/file_utils.cpp

@@ -45,7 +45,7 @@
      in.read(&contents[0], limited_size);
      in.close();
   } else {
      throw(std::strerror(errno));
      throw runtime_error(std::strerror(errno));
   }
   return contents;
}