Before you update from svn, make a backup of your ispconfig database. Then:
Update ISPConfig from SVN:
1) Install subsversion client, for Ubuntu and debian it is:
apt-get install subversion
2) Run the script:
and select SVN as update method.
Warning: It is normally not recommended to update to svn on a production system!! In this case, todays svn revision is identical to what we plan to release as 126.96.36.199 beta 2, so its ok. Tomorrow it might not be ok anymore. So the above solution is just for this special case today and not a general recommendation.
3) kill all ispconfig cron processes and then run the command:
rm -f /usr/local/ispconfig/temp/.ispconfig_lock
to remove the lock file.