'Unknown Authn provider: ldap' 

 缺少加载ldap相关 module,加载之就ok了

 再记录一下步骤:

 1.验证ldap连接

 ldapsearch -h yourldapserver -p yourldapserviceport -x -b 'yourbasedn' -D 'yourbasednuser' -w yourbasednuserpassword 

  libapache2-svn

 dpkg returned an error code (1) 

 apt-get remove libapache2-svn 后 重新安装后还是不行

 google得到:

Do you have a problem with libapache2-svn?
Does it tell you it’s partly configured, and that ERROR: Module dav_svn does not exist!?
Well, just create the folders
/etc/apache2/mods-available/dav_svn.conf 
/etc/apache2/mods-available/dav_svn.load 
and you can remove it.
And you can do a purge to completely remove it, including the config files you just created:
aptitude purge libapache2-svn

aptitude purge libapache2-svn

 再重新安装,搞定!