diff -Nurd mono-6.6.0.161.old/mono/tests/Makefile.am mono-6.6.0.161/mono/tests/Makefile.am
--- mono-6.6.0.161.old/mono/tests/Makefile.am	2020-07-02 16:22:55.467038705 +0000
+++ mono-6.6.0.161/mono/tests/Makefile.am	2020-07-02 16:31:31.637032664 +0000
@@ -3142,7 +3142,7 @@
 # Tests for the Mono lldb plugin
 EXTRA_DIST += test_lldb.py test-lldb.cs
 test-lldb: test-lldb.exe
-	python test_lldb.py $(JITTEST_PROG)
+	python3 test_lldb.py $(JITTEST_PROG)
 
 noinst_LTLIBRARIES = libtest.la
 
diff -Nurd mono-6.6.0.161.old/mono/tests/Makefile.in mono-6.6.0.161/mono/tests/Makefile.in
--- mono-6.6.0.161.old/mono/tests/Makefile.in	2020-07-02 16:22:55.467038705 +0000
+++ mono-6.6.0.161/mono/tests/Makefile.in	2020-07-02 16:31:20.937032789 +0000
@@ -3509,7 +3509,7 @@
 coreclr-gcstress:
 	$(MAKE) -C $(mono_build_root)/acceptance-tests coreclr-gcstress
 test-lldb: test-lldb.exe
-	python test_lldb.py $(JITTEST_PROG)
+	python3 test_lldb.py $(JITTEST_PROG)
 
 test-internalsvisibleto: test-runner.exe $(INTERNALSVISIBLETO_TEST) $(INTERNALSVISIBLETO_TESTAOT) $(INTERNALSVISIBLETO_TESTAOT_LIBS)
 	$(TOOLS_RUNTIME) $(TEST_RUNNER) --testsuite-name $@ $(INTERNALSVISIBLETO_TEST)
diff -Nurd mono-6.6.0.161.old/mono/tests/gc-descriptors/gen-descriptor-tests.py mono-6.6.0.161/mono/tests/gc-descriptors/gen-descriptor-tests.py
--- mono-6.6.0.161.old/mono/tests/gc-descriptors/gen-descriptor-tests.py	2020-07-02 16:22:55.467038705 +0000
+++ mono-6.6.0.161/mono/tests/gc-descriptors/gen-descriptor-tests.py	2020-07-02 16:32:05.947032262 +0000
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 from optparse import OptionParser
diff -Nurd mono-6.6.0.161.old/mono/utils/jemalloc/Makefile.in mono-6.6.0.161/mono/utils/jemalloc/Makefile.in
--- mono-6.6.0.161.old/mono/utils/jemalloc/Makefile.in	2020-07-02 16:22:55.447038705 +0000
+++ mono-6.6.0.161/mono/utils/jemalloc/Makefile.in	2020-07-02 16:30:54.457033099 +0000
@@ -632,11 +632,11 @@
 
 define ValidateVersionTemplate
 #$(eval REPOSITORY_$(2):=$(shell test -z $(3) && echo $(1) || echo "$(3)"))
-#$(eval DIRECTORY_$(2):=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-dir $(1)))
+#$(eval DIRECTORY_$(2):=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-dir $(1)))
 #$(eval DIRECTORY_$(2):=$(shell test -z $(DIRECTORY_$(2)) && echo $(1) || echo $(DIRECTORY_$(2))))
-#$(eval MODULE_$(2):=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-url $(1)))
-#$(eval NEEDED_$(2)_VERSION:=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-rev $(1)))
-#$(eval $(2)_BRANCH_AND_REMOTE:=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-remote-branch $(1)))
+#$(eval MODULE_$(2):=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-url $(1)))
+#$(eval NEEDED_$(2)_VERSION:=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-rev $(1)))
+#$(eval $(2)_BRANCH_AND_REMOTE:=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-remote-branch $(1)))
 
 #$(eval $(2)_VERSION:=$$$$(shell cd $($(2)_PATH) 2>/dev/null && git rev-parse HEAD ))
 
@@ -728,19 +728,19 @@
 
 __bump-version-%:
 	@if [ "$(REV)" = "" ]; then echo "Usage: make bump-version-$* REV=<ref>"; exit 1; fi
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $(REV)
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $(REV)
 	@if [ "$(COMMIT)" = "1" ]; then echo "[submodules] Bump $* to pick up $(REV)." | git commit -F - $(SUBMODULES_CONFIG_FILE); fi
 
 __bump-branch-%:
 	@if [ "$(BRANCH)" = "" ]; then echo "Usage: make bump-branch-$* BRANCH=<branch> REMOTE_BRANCH=<remote branch>"; exit 1; fi
 	@if [ "$(REMOTE_BRANCH)" == "" ]; then echo "Usage: make bump-branch-$* BRANCH=<branch> REMOTE_BRANCH=<remote branch>"; exit 1; fi
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-branch $* $(BRANCH)
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-remote-branch $* $(REMOTE_BRANCH)
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-branch $* $(BRANCH)
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-remote-branch $* $(REMOTE_BRANCH)
 	@if [ "$(COMMIT)" = "1" ]; then echo "[submodules] Bump $* to switch to $(BRANCH) $(REMOTE BRANCH)." | git commit -F - $(SUBMODULES_CONFIG_FILE); fi
 
 __bump-current-version-%:
 	REV=$(shell cd $(ACCEPTANCE_TESTS_PATH)/$* && git log -1 --pretty=format:%H); \
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $$REV; \
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $$REV; \
 	if [ "$(COMMIT)" = "1" ]; then echo "[submodules] Bump $* to pick up $$REV:" | git commit -F - $(SUBMODULES_CONFIG_FILE); fi
 
 $(eval $(call ValidateVersionTemplate,jemalloc,JEMALLOC))
diff -Nurd mono-6.6.0.161/mono/mini/Makefile.in mono-6.6.0.161.new/mono/mini/Makefile.in
--- mono-6.6.0.161/mono/mini/Makefile.in	2019-12-10 07:57:17.000000000 +0000
+++ mono-6.6.0.161.new/mono/mini/Makefile.in	2020-07-02 16:37:51.297028220 +0000
@@ -1287,7 +1287,7 @@
 libmonoinclude_HEADERS = jit.h
 CSFLAGS = -unsafe -nowarn:0219,0169,0414,0649,0618
 GENMDESC_OPTS = 
-GENMDESC_PRG = python $(srcdir)/genmdesc.py $(target_define) $(srcdir)
+GENMDESC_PRG = python3 $(srcdir)/genmdesc.py $(target_define) $(srcdir)
 LLVM_AOT_RUNTIME_OPTS = $(if $(LLVM),--llvm,)
 @AMD64_FALSE@LLVM_AOT_COMPILER_OPTS = 
 @AMD64_TRUE@LLVM_AOT_COMPILER_OPTS = $(if $(LLVM),"=llvmllc=-mcpu=generic -mattr=+sse3",)
diff -Nurd mono-6.8.0.123/acceptance-tests/Makefile.in mono-6.8.0.123.new/acceptance-tests/Makefile.in
--- mono-6.8.0.123/acceptance-tests/Makefile.in	2020-05-11 18:05:40.000000000 +0000
+++ mono-6.8.0.123.new/acceptance-tests/Makefile.in	2020-07-04 18:56:11.214908746 +0000
@@ -5743,11 +5743,11 @@
 
 define ValidateVersionTemplate
 #$(eval REPOSITORY_$(2):=$(shell test -z $(3) && echo $(1) || echo "$(3)"))
-#$(eval DIRECTORY_$(2):=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-dir $(1)))
+#$(eval DIRECTORY_$(2):=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-dir $(1)))
 #$(eval DIRECTORY_$(2):=$(shell test -z $(DIRECTORY_$(2)) && echo $(1) || echo $(DIRECTORY_$(2))))
-#$(eval MODULE_$(2):=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-url $(1)))
-#$(eval NEEDED_$(2)_VERSION:=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-rev $(1)))
-#$(eval $(2)_BRANCH_AND_REMOTE:=$(shell python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-remote-branch $(1)))
+#$(eval MODULE_$(2):=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-url $(1)))
+#$(eval NEEDED_$(2)_VERSION:=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-rev $(1)))
+#$(eval $(2)_BRANCH_AND_REMOTE:=$(shell python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) get-remote-branch $(1)))
 
 #$(eval $(2)_VERSION:=$$$$(shell cd $($(2)_PATH) 2>/dev/null && git rev-parse HEAD ))
 
@@ -5839,19 +5839,19 @@
 
 __bump-version-%:
 	@if [ "$(REV)" = "" ]; then echo "Usage: make bump-version-$* REV=<ref>"; exit 1; fi
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $(REV)
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $(REV)
 	@if [ "$(COMMIT)" = "1" ]; then echo "[submodules] Bump $* to pick up $(REV)." | git commit -F - $(SUBMODULES_CONFIG_FILE); fi
 
 __bump-branch-%:
 	@if [ "$(BRANCH)" = "" ]; then echo "Usage: make bump-branch-$* BRANCH=<branch> REMOTE_BRANCH=<remote branch>"; exit 1; fi
 	@if [ "$(REMOTE_BRANCH)" == "" ]; then echo "Usage: make bump-branch-$* BRANCH=<branch> REMOTE_BRANCH=<remote branch>"; exit 1; fi
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-branch $* $(BRANCH)
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-remote-branch $* $(REMOTE_BRANCH)
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-branch $* $(BRANCH)
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-remote-branch $* $(REMOTE_BRANCH)
 	@if [ "$(COMMIT)" = "1" ]; then echo "[submodules] Bump $* to switch to $(BRANCH) $(REMOTE BRANCH)." | git commit -F - $(SUBMODULES_CONFIG_FILE); fi
 
 __bump-current-version-%:
 	REV=$(shell cd $(ACCEPTANCE_TESTS_PATH)/$* && git log -1 --pretty=format:%H); \
-	python $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $$REV; \
+	python3 $(SCRIPT) $(SUBMODULES_CONFIG_FILE) set-rev $* $$REV; \
 	if [ "$(COMMIT)" = "1" ]; then echo "[submodules] Bump $* to pick up $$REV:" | git commit -F - $(SUBMODULES_CONFIG_FILE); fi
 
 $(eval $(call ValidateVersionTemplate,benchmarker,BENCHMARKER))