How to disable ipv6 in Ubuntu Gutsy

Add the following line to /etc/blacklist
blacklist ipv6

How to disable the PC onboard/motherboard speaker in Linux/Ubuntu

modprobe -r pcspkr

Monitoring HDD/hard-disk/hard-drive temperature with Ubuntu

Tested on Feisty

Monitoring hard-disk temperature

root@server:~# apt-get install hddtemp
root@server:~# hddtemp /dev/sda
/dev/sda: WDC WD1600JS-00NCB1: 37°C