I was able to install Abaqus 2021 on my Ubuntu / Pop OS 20.04 computer using the following steps:
- I started a CentOS 7 virtual machine that I have and ran the Abaqus 2021 installer on the VM.
- I copied the Abaqus 2021 files to my Ubuntu computer
- Everything works!
The Abaqus 2021 installer does not run on Ubuntu since it is an unsupported OS. It may be possible to modify a number of installation files in order to trick the installer to think the computer runs a supported OS, but I think it is easier to simply run the installer on a different computer and then copying the file.