Small tunings

scripts/install-packages.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+set -E -o errexit -o nounset -o pipefail
+
+cat $LWS/conf/packages.txt | grep -v '^\s*#' | sudo xargs apt-get install -y

scripts/sudo-user.sh

@@ -4,7 +4,7 @@ set -E -o errexit -o nounset -o pipefail
 
 USER_FILE="/etc/sudoers.d/$USER"
 
-if [ -f $USER_FILE ]; then
+if [[ -f $USER_FILE ]]; then
   echo "Sudo file $USER_FILE already exists!"
   exit 1
 fi