Today, my wife (at home) has called me (at work) because she could not launch chrome anymore. The disk was full. The files /var/log/kern.log and syslog were eating gigabytes. I was able to solve her problem remotely. I have also installed ubuntu on the computer of my old father who lives far. Regularly, I upload pictures (he is my backup for pictuers) and put a shortcut on his desktop.