Remove Ubuntu 18.04 and SUSE 15.2

cmake/ConfigCPack.cmake

@@ -47,7 +47,7 @@ set(CPACK_RESOURCE_FILE_LICENSE "${PROJECT_SOURCE_DIR}/LICENSE")
 set(CPACK_INCLUDE_TOPLEVEL_DIRECTORY OFF)
 set(OMNITRACE_CPACK_SYSTEM_NAME
     "${_SYSTEM_NAME}"
-    CACHE STRING "System name, e.g. Linux or Ubuntu-18.04")
+    CACHE STRING "System name, e.g. Linux or Ubuntu-20.04")
 set(OMNITRACE_CPACK_PACKAGE_SUFFIX "")
 
 if(OMNITRACE_USE_HIP

cmake/Templates/omnitrace-install.py.in

@@ -103,8 +103,8 @@ def get_os_info(os_distrib, os_version):
             if "debian" in _os_info["ID_LIKE"]:
                 os_distrib = "ubuntu"
                 if os_version is None:
-                    # fallback on 18.04 if ID is not ubuntu but debian-like
-                    os_version = "18.04"
+                    # fallback on 20.04 if ID is not ubuntu but debian-like
+                    os_version = "20.04"
             elif "suse" in _os_info["ID_LIKE"]:
                 os_distrib = "opensuse"
                 # fallback on 15.3 if ID is not opensuse but suse-like