Add dependency checks

run_linux.sh

@@ -2,6 +2,42 @@
 
 set -eu
 
+if ! command -v virtualenv &> /dev/null
+then
+	echo "virtualenv could not be found, please install with:"
+	echo "sudo apt install python3-virtualenv"
+	exit
+fi
+
+if ! command -v wget &> /dev/null
+then
+	echo "wget could not be found, please install with:"
+	echo "sudo apt install wget"
+	exit
+fi
+
+if ! command -v unzip &> /dev/null
+then
+	echo "unzip could not be found, please install with:"
+	echo "sudo apt install unzip"
+	exit
+fi
+
+if ! command -v python3 &> /dev/null
+then
+	echo "python3 could not be found, please install with:"
+	echo "sudo apt install python3"
+	exit
+fi
+
+if ! command -v pip3 &> /dev/null
+then
+	echo "pip3 could not be found, please install with:"
+	echo "sudo apt install pip3"
+	exit
+fi
+
+
 # download minecraft data
 
 if [ ! -d "minecraft_data" ]