This is problem I've encountered after upgrade to kde-3.5.5. Any kde application during opening printing dialog fails with the following error message: ****** Unable to retrieve the printer list. Error message received from manager. Connection to CUPS server failed. Check that the CUPS server us correctly installed and running. Error: localhost: read failed (15). ****** My CUPS is working (I can connect to http://localhost:631) and more important: if I start kprinter application it manages to receive printer list! Also in console I got printer list. This problem was reported upstream: http://bugs.kde.org/show_bug.cgi?id=135561 TIA
*** This bug has been marked as a duplicate of 151261 ***