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There are pre-built ROS packages for the 18.04 amd64 (64-bit), but not for 18.04 i386 (32-bit). (See http://wiki.ros.org/melodic ).
It looks like the n570 processor is 64-bit, so I recommend that you upgrade to a 64-bit version of Ubuntu unless you have a very good reason not to. The 64-bit OS allows you to use the 64-bit registers on your CPU, which should allow it to run faster and more efficiently.
If you can't upgrade to the 64-bit OS, you can also install ROS from source: http://wiki.ros.org/melodic/Installation/Source , but be prepared to spend a while compiling. With 2GB of RAM, I recommend you build with -j1 or -j2 (two parallel threads) at most, otherwise you will probably run out of memory when trying to build OpenCV and PCL.
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