How to prepare Sentinel-1 images stack for PSI/SBAS in SNAP

You do not need to change the operating system to solve the segmentation fault error. This issue can be solved on Ubuntu 20.04 by adding the old xenial repositories to /etc/apt/source.list:
##GCC 4.8
deb http://dk.archive.ubuntu.com/ubuntu/ xenial main
deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe
Then:
sudo apt-get update
sudo apt-get install gcc-4.8 g++-4.8

Finally in the make file PATH_TO_STAMP/src/Makefile change line 40 from CC = gcc to CC=g++-4.8

The same thing can be done in Debian 10 by adding deb https://deb.debian.org/debian/ jessie main to /etc/apt/source.list and then do the same steps as in the Ubuntu case. This will add Debian 9 Jessie repository to the list.

I hope this can help.

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