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Do you actually have a C++ compiler installed?

Try the following:

sudo apt-get update && sudo apt-get install build-essential

I would've assumed that would be installed automatically, but perhaps that is not true for your system.

Then rm -rf /home/user/catkin_ws/{build,devel} and try again.

Do you actually have a C++ compiler installed?

Try the following:

sudo apt-get update && sudo apt-get install build-essential

I would've assumed that would be installed automatically, but perhaps that is not true for your system.

Then rm -rf /home/user/catkin_ws/{build,devel} and try again.

Do you actually have a C++ compiler installed?

Try the following:

sudo apt-get update && sudo apt-get install build-essential

I would've assumed that would be installed automatically, but perhaps that is not true for your system.

Then rm -rf /home/user/catkin_ws/{build,devel} and try again.

Edit: and you can run /usr/bin/c++?

sudo apt-get install build-essential g++

Do you actually have a C++ compiler installed?

Try the following:

sudo apt-get update && sudo apt-get install build-essential

I would've assumed that would be installed automatically, but perhaps that is not true for your system.

Then rm -rf /home/user/catkin_ws/{build,devel} and try again.

Edit: and you can run /usr/bin/c++?

Your Edit2: your latest edit makes me wonder if you really do have a C++ compiler installed.

Please run:

sudo apt-get install build-essential g++

Then rm -rf /home/user/catkin_ws/{build,devel} and try again.