Ubuntu 20.04 catkin_make BUG

[xieyunjiao-holo]

Hello! I used the gcc-7.5 and g++7.5, How can this problem be fixed? Thank you～

[kermitLHH]

You can try "sudo apt-get install libgfortran-7-dev",then catkin_make again.I make it by this way.

[BizzareNathan]

I recently ran into this problem, I checked my gfortran installation steps and didn't find anything that could cause it to fail, and tried "sudo apt-get install libgfortran-7-dev", still no problem. And running "ld -lgfortran --verbose" resulted in not found.

As a last resort, I remembered that I had upgraded gcc and g++ to version 9, and after changing back to version 7, I no longer get this error and can run the simulation normally.
(But running "ld -lgfortran --verbose" still results in not found.)

Hope this helps!