I'm installing on Redhat8 and/or Ubuntu2004 and/or Ubuntu2204. Compilation of ISSM on RH8 seems to have worked per the documentation; I'm testing with the Matlab build. I find that Ubuntu22 is needed to get a recent enough libm.so.6 - seems like GLIBC2.32 is required. This is way more recent than the documented "Ubuntu18 or more recent". It looks like libm, libc, and libstdc++ all have this same issue - the system supplied versions have to be recent enough for the pre-compiled Matlab requirements. Even RH9 fails since the ISSM-Linux-MATLAB/lib/libgcc wants GLIBC-2.35