diff --git a/Makefile b/Makefile
index 785ed2fde..75c74aab5 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,8 @@ clean:
 	rm -rf isolate
 
 install-isolate:
-	sudo $(PACKAGE_MGR_INSTALL) libsystemd-dev
+	sudo $(PACKAGE_MGR_INSTALL) libcap-dev libsystemd-dev
+	sudo groupadd $(CMS_USER_GROUP) || true
 	git clone https://github.com/ioi/isolate.git
 	cd isolate && make isolate
 	cd isolate && sudo cp ./isolate $(USR_ROOT)/bin/isolate
@@ -31,7 +32,7 @@ install-isolate:
 
 python-apt-deps:
 	sudo add-apt-repository -y ppa:deadsnakes/ppa
-	sudo apt-get update || true
+	sudo apt-get update
 	sudo $(PACKAGE_MGR_INSTALL) $(PYTHON_BIN) $(PYTHON_BIN)-dev $(PYTHON_BIN)-venv \
 	python3-pip