diff --git a/Vagrantfile b/Vagrantfile
index dc6d07e..a1dec32 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -10,7 +10,7 @@ Vagrant.configure("2") do |config|
   # For a complete reference, please see the online documentation at
   # https://docs.vagrantup.com.
 
-  config.vm.define :ynh_tests
+  config.vm.define :ynhtests
   config.vm.box = "yunohost/jessie-stable"
 
   # Disable auto updates checks. Run `vagrant outdated` to perform manual updates.
@@ -26,41 +26,68 @@ Vagrant.configure("2") do |config|
   # using a specific IP.
   config.vm.network "private_network", ip: "192.168.33.10"
 
+  # Use the NAT hosts DNS resolver. Fixes slow network in the guest.
+  # See https://serverfault.com/questions/495914/vagrant-slow-internet-connection-in-guest
+  config.vm.provider "virtualbox" do |v|
+    v.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
+    v.customize ["modifyvm", :id, "--natdnsproxy1", "on"]
+    v.customize ["modifyvm", :id, "--nictype1", "virtio"]
+  end
+
   # Share an additional folder to the guest VM. The first argument is
   # the path on the host to the actual folder. The second argument is
   # the path on the guest to mount the folder. And the optional third
   # argument is a set of non-required options.
-  config.vm.synced_folder "./", "/vagrant"
+  config.vm.synced_folder "./", "/vagrant",
+    owner: "root",
+    group: "sudo",
+    mount_options: ["dmode=775,fmode=774"]
 
   # Enable provisioning with a shell script. Additional provisioners such as
   # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
   # documentation for more information about their specific syntax and use.
   config.vm.provision "shell", privileged: false, keep_color: true, inline: <<-SHELL
-    DOMAIN=ynh-tests.local
+    DOMAIN=ynhtests.local
     YUNOHOST_ADMIN_PASSWORD="alpine"
 
     # Stop on first error
     set -e
 
     if ! [[ -f /etc/yunohost/installed ]]; then
-      # Upgrade Yunohost and the system packages (disabled)
+      # Upgrade Yunohost and the system packages
       sudo apt-get update
       sudo apt-get upgrade --yes
-      sudo apt-get dist-upgrade --yes
+      # Run dist-upgrade twice, as the first Yunohost upgrade may fail
+      sudo apt-get dist-upgrade --yes || sudo apt-get dist-upgrade --yes
 
       # Finish Yunohost installation
       sudo yunohost tools postinstall --domain ${DOMAIN} --password ${YUNOHOST_ADMIN_PASSWORD} --ignore-dyndns
     fi
 
-    # Install lxc
-    # if ! hash lxc-start 2>/dev/null; then
-    #   DEBIAN_FRONTEND=noninteractive sudo apt-get update
-    #   DEBIAN_FRONTEND=noninteractive sudo apt-get install --yes --fix-missing lxc
-    # fi
-
     # Install package_check
     if ! [ -f "$HOME/package_check/package_check.sh" ]; then
       git clone https://github.com/YunoHost/package_check
+      # Checkout our custom patches (until they get merged upstream)
+      cd package_check
+      git remote add kemenaran https://github.com/kemenaran/package_check.git
+      git fetch kemenaran
+      git checkout --track kemenaran/fixes
+
+      # Fix LXC containers not being able to reach outside internet.
+      # The default configuration is to detect the default gateway used
+      # by the Vagrant machine to configure LXC containers.
+      # Unfortunately this results in the LXC containers not being able
+      # to connect to the Internet.
+      echo "dns=8.8.8.8" > $HOME/package_check/config
+    fi
+
+    # Build the initial LXC container
+    if ! hash lxc-start 2>/dev/null || [ "$(sudo lxc-ls | wc -l)" == "0" ]; then
+      # Build the default LXC container
+      $HOME/package_check/sub_scripts/lxc_build.sh
+
+      # Ensure the LXC container is correctly configured
+      $HOME/package_check/sub_scripts/lxc_check.sh
     fi
   SHELL
 end
diff --git a/check_process b/check_process
index 5b21f75..5151a8f 100644
--- a/check_process
+++ b/check_process
@@ -1,6 +1,6 @@
 ;; Mattermost
     ; Manifest
-        domain="ynh-tests.local"    (DOMAIN)
+        domain="ynhtests.local"    (DOMAIN)
         path="" (PATH)
         language="fr"
         is_public=1 (PUBLIC|public=1|private=0)
diff --git a/test.sh b/test.sh
index 689e452..489e521 100755
--- a/test.sh
+++ b/test.sh
@@ -10,7 +10,7 @@ set -e
 # Configuration constants
 APP_NAME="mattermost"
 APP_DIR="/vagrant"
-DOMAIN="ynh-tests.local"
+DOMAIN="ynhtests.local"
 VM_ROOT_PASSWORD="alpine"
 YUNOHOST_ADMIN_PASSWORD="alpine"
 
@@ -142,7 +142,7 @@ function test_simple_restore() {
 
 function test_package_check() {
   echo "--- Running package_check ---"
-  _vagrant_ssh "package_check/package_check.sh --bash-mode '$APP_DIR'"
+  _vagrant_ssh "package_check/package_check.sh --build-lxc --bash-mode '$APP_DIR'"
 }
 
 function teardown() {
@@ -151,8 +151,7 @@ function teardown() {
 
 _parse_args $*
 setup
-# Package_check is disabled until LXC containers work properly inside the Vagrant VM
-#test_package_check
+test_package_check
 test_simple_install
 test_simple_upgrade
 test_simple_backup