How do I turn off screen timeout in Linux?

Select the System Settings from the icon located on the far right in your top panel. Once there select the Brightness & Lock settings. It will look as I’ve shown below. Change the “Turn screen off when inactive for” to never , and change the “Lock Screen” switch to off .

How do I change the screen lock time in Ubuntu?

To set the length of time before your screen locks automatically:

1. Open the Activities overview and start typing Privacy.
2. Click on Screen Lock to open the panel.
3. Make sure Automatic Screen Lock is switched on, then select a length of time from the Automatic Screen Lock Delay drop-down list.