Hi, after a painful installation on Ubuntu 12.04 (tomcat 7), LabKey 14.1 starts up happily. The Admin Console works fine. I can create Projects as Admin, but whenever I go to http://localhost:8080/labkey/project/home/begin.view?, the following error comes up:
500: Unexpected server error
org.labkey.portal.ProjectController$ProjectUrlsImpl.getHidePortalPageURL(Lorg/labkey/api/data/Container;Ljava/lang/String;Lorg/labkey/api/view/ActionURL;)Lorg/labkey/api/view/ActionURL;
...
request attributes
LABKEY.StartTime = 1401916093656
LABKEY.container = /Test
LABKEY.action = begin
LABKEY.RequestURL = /labkey/project/Test/begin.view?
LABKEY.OriginalURLHelper = /labkey/project/Test/begin.view?
LABKEY.controller = project
X-LABKEY-CSRF = f405132fa5b689fbf738ff5cee43591c
LABKEY.Counter = 0
LABKEY.OriginalURL = http://localhost:8080/labkey/project/Test/begin.view?

core schema database configuration
Server URL    jdbc:postgresql://localhost/labkey
Product Name    PostgreSQL
Product Version    9.1.13
Driver Name    PostgreSQL Native Driver
Driver Version    PostgreSQL 9.3 JDBC4.1 (build 1100)

***Test is a project I created as Admin.***

root@rob-HP-Pavilion-TS-14-Notebook-PC:/opt/labkey# ls -al
total 52
drwxr-xr-x 7 tomcat7 root 4096 Jun 4 13:26 .
drwxr-xr-x 6 root root 4096 Jun 4 13:24 ..
drwxrwxr-x 2 tomcat7 root 4096 Jun 3 15:09 bin
drwxr-xr-x 7 tomcat7 tomcat7 4096 Jun 4 15:42 files
-rw-r--r-- 1 tomcat7 tomcat7 222 Jun 4 13:25 heapDumpRequest
-rw-r--r-- 1 root root 60 Jun 4 13:24 .labkeyInstalled
drwxrwxr-x 64 tomcat7 root 12288 Jun 4 13:32 labkeywebapp
drwxrwxr-x 30 tomcat7 root 4096 Jun 4 13:32 modules
drwxrwxr-x 2 tomcat7 root 4096 Jun 3 15:09 pipeline-lib
-rw-r--r-- 1 tomcat7 tomcat7 171 Jun 4 13:25 threadDumpRequest
-rw-r--r-- 1 tomcat7 root 11 Mär 22 03:45 VERSION
root@rob-HP-Pavilion-TS-14-Notebook-PC:/opt/labkey#

The owner of /opt/labkey and subdirectories is tomcat7.

Any hints?