diff --git a/basic/srv/vm/mgr/pkgmgr.py b/basic/srv/vm/mgr/pkgmgr.py
index b390847..051f720 100644
--- a/basic/srv/vm/mgr/pkgmgr.py
+++ b/basic/srv/vm/mgr/pkgmgr.py
@@ -22,9 +22,7 @@ class PackageManager:
         # Load JSON configuration
         self.conf = conf
         self.online_packages = {}
-        self.pending = False
-        self.pending_to_download = 0
-        self.pending_downloaded = 0
+        self.pending = 0
 
     def get_repo_resource(self, url, stream=False):
         return requests.get('{}/{}'.format(self.conf['repo']['url'], url), auth=(self.conf['repo']['user'], self.conf['repo']['pwd']), stream=stream)
@@ -38,22 +36,21 @@ class PackageManager:
         pub_key.verify(packages_sig, packages, ec.ECDSA(hashes.SHA512()))
         self.online_packages = json.loads(packages)
 
-    def register_pending_installation(self):
+    def register_pending_installation(self, name):
         # Registers pending installation. Fetch online packages here instead of install_pacakges() to fail early if the repo isn't reachable
         self.fetch_online_packages()
-        self.pending = True
-        self.pending_to_download = 1
-        self.pending_downloaded = 0
+        self.pending = 1
+        deps = [d for d in self.get_deps(name) if d not in self.conf['packages']]
+        return sum(self.online_packages[d]['size'] for d in deps)
 
     def install_package(self, name):
         # Main installation function. Wrapper for download, registration and install script
-        deps = d for d in self.get_deps(name) if d not in self.conf['packages']
-        self.pending_to_download = sum(self.online_packages[d]['size'] for d in deps)
+        deps = [d for d in self.get_deps(name) if d not in self.conf['packages']]
         for dep in deps:
             self.download_package(dep)
             self.register_package(dep)
             self.run_install_script(dep)
-        self.pending = False
+        self.pending = 0
 
     def uninstall_package(self, name):
         # Main uninstallation function. Wrapper for uninstall script, filesystem purge and unregistration
@@ -69,7 +66,7 @@ class PackageManager:
         with open(tmp_archive, 'wb') as f:
             for chunk in r.iter_content(chunk_size=65536):
                 if chunk:
-                    self.pending_downloaded += f.write(chunk)
+                    self.pending += f.write(chunk)
         # Verify hash
         if self.online_packages[name]['sha512'] != hash_file(tmp_archive):
             raise InvalidSignature(name)
diff --git a/basic/srv/vm/mgr/wsgiapp.py b/basic/srv/vm/mgr/wsgiapp.py
index d196c83..29c4793 100644
--- a/basic/srv/vm/mgr/wsgiapp.py
+++ b/basic/srv/vm/mgr/wsgiapp.py
@@ -141,13 +141,16 @@ class WSGIApp(object):
 
     def setup_apps_view(self, request):
         # Application manager view.
-        self.pkgmgr.fetch_online_packages()
+        try:
+            self.pkgmgr.fetch_online_packages()
+        except:
+            pass
         all_apps = sorted(set([k for k,v in self.pkgmgr.online_packages.items() if 'host' in v] + list(self.conf['apps'].keys())))
         return self.render_template('setup-apps.html', request, all_apps=all_apps, online_packages=self.pkgmgr.online_packages)
 
-    def render_setup_apps_row(self, app, app_title, pending=False):
+    def render_setup_apps_row(self, app, app_title, total_size=None):
         t = self.jinja_env.get_template('setup-apps-row.html')
-        return t.render({'app': app, 'app_title': app_title, 'conf': self.conf, 'pending': pending})
+        return t.render({'app': app, 'app_title': app_title, 'conf': self.conf, 'total_size': total_size})
 
     def update_host_action(self, request):
         # Update domain and port, then restart nginx
@@ -285,19 +288,19 @@ class WSGIApp(object):
             return self.render_json({'error': request.session.lang.installation_in_progress()})
         try:
             app = request.form['app']
-            self.pkgmgr.register_pending_installation()
+            total_size = self.pkgmgr.register_pending_installation(app)
         except (BadRequest, InvalidValueException):
             return self.render_json({'error': request.session.lang.malformed_request()})
         except:
             return self.render_json({'error': request.session.lang.package_manager_error()})
         app_title = self.pkgmgr.online_packages[app]['title']
-        response = self.render_json({'ok': self.render_setup_apps_row(app, app_title, True)})
-        response.call_on_close(lambda: pkgmgr.install_package(app))
+        response = self.render_json({'ok': self.render_setup_apps_row(app, app_title, round(total_size / 1048576, 1))})
+        response.call_on_close(lambda: self.pkgmgr.install_package(app))
         return response
 
     def get_install_progress_action(self, request):
         if self.pkgmgr.pending:
-            return self.render_json({'progress': '{0:.1f}'.format(self.pkgmgr.pending_downloaded / self.pkgmgr.pending_to_download)})
+            return self.render_json({'progress': round(self.pkgmgr.pending / 1048576, 1)})
         self.conf.load()
         app = request.form['app']
         app_title = self.conf['apps'][app]['title']
diff --git a/basic/srv/vm/static/js/admin.js b/basic/srv/vm/static/js/admin.js
index 78208b3..47fe08e 100644
--- a/basic/srv/vm/static/js/admin.js
+++ b/basic/srv/vm/static/js/admin.js
@@ -12,11 +12,11 @@ $(function() {
         .on('click', '.app-start', start_app)
         .on('click', '.app-stop', stop_app)
         .on('click', '.app-install', install_app)
-        .on('click', '.app-uninstall', install_app);
+        .on('click', '.app-uninstall', uninstall_app);
     $('#update-password').on('submit', update_password);
     $('#reboot-vm').on('click', reboot_vm);
     $('#shutdown-vm').on('click', shutdown_vm);
-    window.setTimeout(check_progress, 1000);
+    window.setInterval(check_progress, 1000);
 });
 
 function update_host() {
@@ -146,7 +146,7 @@ function _do_app(action, ev) {
     $.post('/'+action+'-app', {'app': tr.data('app')}, function(data) {
         if (data.error) {
             td.attr('class','error').html(data.error);
-        } else {
+        } else if (action) {
             tr.replaceWith(data.ok);
         }
     });
@@ -166,7 +166,7 @@ function install_app(ev) {
 }
 
 function uninstall_app(ev) {
-    if (confirm('Do you really want to uninstall this applition?')) {
+    if (confirm('Do you really want to uninstall this application?')) {
         return _do_app('uninstall', ev);
     }
     return false;
@@ -176,7 +176,7 @@ function check_progress() {
     var progress = $('#install-progress');
     if (progress.length) {
         var tr = progress.closest('tr');
-        $.get('/get-install-progress', {'app': tr.data('app')}, function(data) {
+        $.post('/get-install-progress', {'app': tr.data('app')}, function(data) {
             if (data.progress) {
                 progress.text(data.progress);
             } else {
diff --git a/basic/srv/vm/templates/setup-apps-row.html b/basic/srv/vm/templates/setup-apps-row.html
index e0a0eb0..ad0d6d4 100644
--- a/basic/srv/vm/templates/setup-apps-row.html
+++ b/basic/srv/vm/templates/setup-apps-row.html
@@ -2,6 +2,6 @@
     <td>{{ app_title }}</td>
     <td class="center"><input type="checkbox" class="app-visible"{% if app not in conf['apps'] %} disabled{% elif conf['apps'][app]['visible'] %} checked{% endif %}></td>
     <td class="center"><input type="checkbox" class="app-autostart"{% if app not in conf['apps'] %} disabled{% elif is_service_autostarted(app) %} checked{% endif %}></td>
-    <td>{% if pending %}Instalace (<span id="install-progress">0</span> %){% elif app not in conf['apps'] %} Není nainstalována{% elif is_service_started(app) %}<span class="info">Spuštěna</span>{% else %}<span class="error">Zastavena</span>{% endif %}</td>
-    <td>{% if app not in conf['apps'] %}<a href="#" class="app-install">Instalovat</a>{% else %}{% if is_service_started(app) %}<a href="#" class="app-stop">Zastavit</a>{% else %}<a href="#" class="app-start">Spustit</a>{% endif %}, <a href="#" class="app-uninstall">Odinstalovat</a>{% endif %}</td>
+    <td>{% if total_size %}Instalace (<span id="install-progress">0</span> / {{ total_size }} MB){% elif app not in conf['apps'] %} Není nainstalována{% elif is_service_started(app) %}<span class="info">Spuštěna</span>{% else %}<span class="error">Zastavena</span>{% endif %}</td>
+    <td>{% if total_size %}<div class="loader"></div>{% elif app not in conf['apps'] %}<a href="#" class="app-install">Instalovat</a>{% else %}{% if is_service_started(app) %}<a href="#" class="app-stop">Zastavit</a>{% else %}<a href="#" class="app-start">Spustit</a>{% endif %}, <a href="#" class="app-uninstall">Odinstalovat</a>{% endif %}</td>
 </tr>
diff --git a/basic/srv/vm/templates/setup-apps.html b/basic/srv/vm/templates/setup-apps.html
index 4ecc441..4853d5d 100644
--- a/basic/srv/vm/templates/setup-apps.html
+++ b/basic/srv/vm/templates/setup-apps.html
@@ -51,6 +51,9 @@
             {% endfor %}
         </tbody>
     </table>
+    {% if not online_packages %}
+    <p class="error">Připojení k distribučnímu serveru se nezdařilo. Zkontrolujte přístupové údaje a připojení k síti.</p>
+    {% endif %}
 </div>
 
 <div class="setup-box">
diff --git a/basic/srv/vm/wsgi.py b/basic/srv/vm/wsgi.py
index 13b7ffe..4f5c9a8 100755
--- a/basic/srv/vm/wsgi.py
+++ b/basic/srv/vm/wsgi.py
@@ -13,4 +13,4 @@ if __name__ == '__main__':
     from werkzeug.contrib.fixers import ProxyFix
     from werkzeug.serving import run_simple
 
-    run_simple('127.0.0.1', 8080, ProxyFix(application))
+    run_simple('127.0.0.1', 8080, ProxyFix(application), threaded=True)
diff --git a/zz-build/usr/bin/lxc-pack b/zz-build/usr/bin/lxc-pack
index 33f9000..10d8548 100755
--- a/zz-build/usr/bin/lxc-pack
+++ b/zz-build/usr/bin/lxc-pack
@@ -46,9 +46,9 @@ def pack(pkg_file):
         cwd = os.path.dirname(os.path.abspath(pkg_file))
         subprocess.run(['tar', '--transform', 's|^|srv/{}/|'.format(pkg_name), '-rpf', tar_path, 'install', 'install.sh', 'upgrade', 'upgrade.sh', 'uninstall', 'uninstall.sh'], cwd=cwd)
     # Compress the tarball with xz (LZMA2)
-    print('Compressing', tar_path, '({0:.2f} MB)'.format(os.path.getsize(tar_path)/1048576))
+    print('Compressing', tar_path, '({} MB)'.format(round(os.path.getsize(tar_path)/1048576, 2)))
     subprocess.run(['xz', '-9', tar_path])
-    print('Compressed ', xz_path, '({0:.2f} MB)'.format(os.path.getsize(xz_path)/1048576))
+    print('Compressed ', xz_path, '({} MB)'.format(round(os.path.getsize(xz_path)/1048576, 2)))
 
     # Register package
     print('Registering package')