Ubuntu 18.04

This page contains notes and changes introduces with the update to Ubuntu 18.04.

Printers

The CUPS printing service has been switched back to the official way with cups-browsed. That means you will see all printers in the institute, not only those intended for your use. Be carefully when choosing a printer. You can select your default printer with the command 'lpoptions -d PRINTERNAME'.

Update 18.7.19: Printers are still pain. They disappear sometimes from the announcement service of the print server. We are working on a solution for this.

Emergency work around for the printers

If the printers disappeared from the list and no admin is available, the is are workaround you can apply yourself. But this can imply other problems, if to many users use it.

Cups client library has the option to connect directly to server and not to the local spooler. This circumvents the browsing problem. But this has the drawback that the server may run out of connections if to many people use it. The client opens one TCP connection for each printer.

Create a file in your home ".cups/client.conf". The .cups directory may not exist. The the following line to the file:

   ServerName print-itp:631

If you want to switch back, you can just comment out the line with a '#' in front.

Computer is very slow

In the case the KDE full test indexing, call 'baloo' is consuming all your network bandwidth. Benefit is rather small, you should disable this service. It's a use service. We have disabled this service in other desktop environment except KDE Plasma in later installations. This issue popped up already with Ubuntu 16.04, you will find instructions here: Baloo_file_indexing