Reordering or changing system services during a particular runlevel is rarely necessary when using Ubuntu unless some disaster occurs. But system administrators should have a basic understanding of how Linux boots and how services are controlled in order to perform troubleshooting or to diagnose problems. By using additional utilities such as the
dmesg | less command to read kernel output after booting or by examining system logging with
cat /var/log/messages | less, it is possible to gain a bit more detail about what is going on when faced with troublesome drivers or service failure.
To better understand how to troubleshoot service problems in Ubuntu, look at the diagnosis and resolution of a typical service-related ...