Cannot open shared object file libssl.so.1.1

[Wile_E_Coyote]

@smgrig These dependencies are valid when you want to build ROOT from the source.

Unfortunately, there exist no lists of system packages (compilers and libraries) that are needed for the “.tar.gz” binary distributions provided by the ROOT Team . See:

Python and ROOT when installing in WSL / Ubuntu

After unpacking a ready-to-use binary distribution (i.e., compiled by somebody else), I first install all missing libraries reported by (ignore several possible “not a dynamic executable” messages): source /where/I/unpacked/my/new/root/bin/thisroot.sh ldd ${ROOTSYS}/lib/*.so | grep "found" | sort -u On a Debian-like system (e.g., Ubuntu), one can then use “apt-file” to find, e.g., the missing “libgsl.so.23”: sudo apt-get install apt-file; sudo apt-file update # needed just once apt-file searc…

Problems in compiling 6.19/6.20 on Ubuntu 20.04

@amadio This post is more than 5 years old but the problem is “known” for more than 10 years (when Ubuntu 10.04 LTS started to provide its own ROOT version): Actually, with ROOT 6 the “problem” became more serious. Because ROOT 6 versions with “cxx11”, “cxx14” and especially “cxx17” are incompatible with one another (and some features will be incompatible with additional, experiment / analysis specific, software), one needs 3 sets of binaries for each ROOT 6 version so, something like 9 = 3 x…