Problems running paraFoam with OpenFOAM 6: "Illegal instruction (core dumped)"
 

i am a fresh man in openfoam. when i first enter paraFoam. there is a mistake. i figure out how to solve it.thanks a lot!
nwm@ubuntu:~/OpenFOAM/nwm-6/run/cavity$ paraFoam&
[1] 2735
nwm@ubuntu:~/OpenFOAM/nwm-6/run/cavity$ Created temporary 'cavity.OpenFOAM'
I/O : uncollated
Illegal instruction (core dumped)

Quick questions:

1. Which installation instructions did you follow?
2. Which Ubuntu version are you using?
3. Is Ubuntu installed in a real machine or in a virtual machine or are you using Docker?
4. If you are using Ubuntu in a real machine, have you installed the graphics card drivers for your machine's graphics card?