Issue: Boot/install CD won't run. Reports I/O errors.
X: Press F6 when the first menu with the Kubuntu logo appears. Type "irqpoll" (without quotes) at the end of the string.

Issue: Mounting Windows NTFS drive.
X: If drive is /dev/hda1 AND mount folder is /mnt/windows
use
$ sudo mkdir -p /mnt/windows
TO MOUNT
use
$ sudo mount /dev/hda1 /mnt/windows -t ntfs -o umask=0222
NTFS is read-only
TO unmount 
use
$ sudo umount /mnt/windows

Issue: Error "The file protocol died unexpectedly" appears at startup.
X: Install avahi-daemon from Adept Manager.

In System Settings: Desktop: Window Behavior set Policy to Focus Follows Mouse.

Make bin folder in your ~ folder. Add export PATH=$PATH:bin to .bashrc 
You can run scripts and programs from the command line without having to type the path.

Issue: File is opening in wrong program when you double-click it.
Press Alt-F2 and type kcontrol. Go to KDE Components and select File Associations.

.bashrc
alias shortcuts=cmd
alias shortcut2='cmd --opt1'
enable .bash_aliases in .bashrc

Find version number for KDE:
Open Konqueror and go to Help>About KDE

Find version number for Kubuntu:
Open Konsole and type lsb_release -a

Mount drive
sudo mount -t filesystem /dev/devtype mountpoint (ie, /media/drivename)

"Hyperactive Disk

If your external harddisk while being in idle mode starts doing something every couple of seconds (and you don’t know what, let alone why ... but you feel annoyed by the resulting noise), it might be worth trying to mount the disk with the (additional) options noatime and noadirtime set. - Background: by this means, read-only access to the disk’s filesystem will no longer be recorded. At least on a non-server system, is seems as if there is no need for this kind of information anyway ;-)"
http://www.penguin.ch/wiki/doku.php/linuces:basics:starting:fstab#mount_by_device_id

Issue: USB drive not mounting (after upgrade to KDE 3.5.5)
do sudo mkdir /mnt/usbdrive
then add /dev/sda1 /mnt/usbdrive auto user 0 0
to /etc/fstab
(note your drive letter may be different; sdb1, sdc1, etc.)

Add Desktop Access Button
Right-click on QuickLaunch bar
Then go to Add Applet

Use CTRL-F1 thru CTRL-F4 to access desktops 1-4.
Press CTRL-ALT-F1 thru CTRL-ALT-F6 to access consoles. Use CTRL-ALT-F7 thru CTRL-ALT-F12 to access GUI.

Issue: Mounting removable drives.
pmount device mountpoint
ex: pmount /dev/sdb keydrive
mounts the device /dev/sdb into a directory /media/keydrive
NOTE this directory must not already exist AND this only works for devices that are NOT in /etc/fstab

Issue: KDE is displaying all military time.
Go to System Settings > Regional and Language
Change region to North America > United States of America

Issue: URLs are opening in Konqueror instead of another browser.
Press Alt-F2 and type kcontrol to get the Control Center.
Go to KDE Components > Default Applications > Web Broser and select "Open http and https URLs in the following browser:" and type /usr/bin/firefox or /usr/bin/mozilla-firefox (depending on the name of the application).

To run scripts at startup (startup programs), test script, and then place in ~/.kde/Autostart/

Issue: Session restore! How do you turn it off?
Alt-F2; type kcontrol
Go to KDE Components > Session Manager, and under On Login, mark "Start with an empty session"

List processes (KDE)
Press CTRL + ESC to bring up the KDE System Guide

Add fonts
1. Drop into ~/.fonts directory
2. Log out & in again OR rebuild the fonts cache with the command "sudo fc-cache -fv"

Burning VCDs.
ffmpeg -i file.avi -target ntsc-vcd file.mpg
Open K3B. Go to File > New Project > New Video CD Project

Change file extensions (batch)
Ex: .htm -> .html
for f in *.htm; do mv $f `basename $f .htm`.html; done;

Command Line shortcuts

*Ctrl-u - delete line
*Ctrl-l - clear the terminal 
*Ctrl-c - kill current process
*Ctrl-z - send current process to the background (use fg to get it back)

Use df -l --local to see disk usage.

Get hardware profile
lshw
lshw -C specific (e.g., lshw -C disk)
use sudo lshw to get more info

Issue: Can't get K3B to burn audio tracks from MP3
Install libk3b2-mp3
(sudo aptitude install)

Use shift-insert to paste!