Jessie with sysvinit - No session for pid <lxpolkit> error

electronick

Hi.After upgrading from Wheezy to Jessie a small error window apears when starting lightdm. The window says - "No session for pid xxxx" where xxxx is the pid of lxpolkit. Internet gives suggestions how to eliminate this error, but all sugestions deal with systemd. When upgrading to Jessie I choosed to keep sysvinit.
There is also a page dealing with this situation: http://without-systemd.org/wiki/ ... ie/sid_installation
I made al the changes suggested there, but unfortunately the package polkit-1 can't be found. Which source for apt should I use?
How to remove this message at startup?
Thank you.