Disable Ubuntu Unity Launcher Autohide

Unity 3D on Ubuntu 11.04 (Natty Narwhal) and Ubuntu 11.10 (Oneiric Ocelot)

Use this method to disable Unity Launcher autohide on Ubuntu 11.04. On Ubuntu 11.10 this will only work if you use Unity 3D. For Unity 2D check the second method below. Unity 2D was introduced in Ubuntu 11.10 to provide Unity interface for computers without accelerated 3D graphics. You can read more about differences here.

1. Install CompizConfig Settings Manager: Open Terminal and run: sudo apt-get installĀ compizconfig-settings-manage
Open Terminal and run: sudo apt-get install compizconfig-settings-manager

2. Open Dash Home, type "compiz" in the search box and open CompizConfig Settings Manager
Open CompizConfig Settings Manager

3. Open Ubuntu Unity Plugin
Disable Ubuntu Unity Launcher Autohide

4. In Hide Launcher select Never.
Disable Ubuntu Unity Launcher Autohide

This will affect only logged on user.

Unity 2D on Ubuntu 11.10 (Oneiric Ocelot)

1. Install dconf-tool tool: Open Terminal and run: sudo apt-get install dconf-tools
Disable Ubuntu Unity Launcher Autohide

2. To disable Unity Launcher auto hide, run: dconf write /com/canonical/unity-2d/launcher/use-strut true
Disable Ubuntu Unity Launcher Autohide

3. To re-enable Unity Launcher auto hide, run: dconf write /com/canonical/unity-2d/launcher/use-strut false
Disable Ubuntu Unity Launcher Autohide

Ubuntu - Disable Music File Preview on Mouseover

In Ubuntu by default if you click on a music file or just mouseover it will automatically start playing the file. Even if there is another file playing.

To disable this behaviour:
Nautilus (File Explorer) > Edit > Preferences > Preview > Preview Sound Files - Never

Ubuntu 10.10

Ubuntu - disable auto screen lock after suspend and hibernate

Disable auto screen lock after suspend and hibernate

Even if during installation you chose "Login in automatically" Ubuntu will prompt you for a password after starting from suspend (sleep) and hibernate.

To change this behaviour try this:

Option 1

System > Preferences > Screensaver
Disable "Lock screen when screensaver is active"

If this doesn't work try:

Option 2

Open terminal (Applications > Accessories > Terminal) and type gconf-editor
navigate to apps > gnome-power-manager > lock and disable all items
If this still doesn't work repeat this but launch gconf-editor with sudo gconf-editor

Even after this Ubuntu may still prompt for a password if you suspend or hibernate using Ubuntu soft power button (top right on the desktop). If you close laptop lid or use CTRL+ALT+DELETE dialog everything works as expected. This is a bug and is discussed in more detail here.

Ubuntu Desktop 10.10
Ubuntu Desktop 11.04

Useful Linux Terminal commands

HDD and partitions

df -h - How much free disk space is available for each mount.

mount -t auto /dev/cdrom /cdfolder - mounts cdrom to /cdfolder
umount /cdfolder - unmounts cdfolder

fdisk -l - show hard drives and partitions
fdisk /dev/sda - start fdisk for sda hard drive
a - bootable flag
p - display partitions table
d - delete a partition
n - create a new partition
t - change partition's ID (83 - for ext2)
q - exit without saving changes
w - save changes and exit

mkfs -t ext2 /dev/sdb1 - build an ext2 file system in an empty partition
fsck -f -y /dev/sdb1 - check and repair a file system on sdb1

Mount hdc1 partition to a /data folder automatically on boot

1. Open /etc/fstab
2. Add line:    /dev/hdc1                 /data                   ext2                defaults             1 2
3. Restart computer

badblocks -n -s -v /dev/hda - Check hda disk for bad blocks.
-n - Use non-destructive read-write mode (only if disk is not mounted). Default - non-destructive read-only test.
-s - Show progress
-v - Verbose mode

File and Folder manipulations

ls -l --block-size=1M - list files in current directory with sizes in MB (K for KB)
ls *.img | wc - count .img files current directory

cp -r /source/directory /target/directory - Copy existing folder to new location

rm -r /dirctory
- Remove a directory with contents
rm * - remove all files from directory

mv old-name new-name - rename files and folders

find -name "example*" - Search for files and folders beginning "example". Searches in in the current directory and subdirectories.
find / -name "example*" - The same as above but searches in root and all subdirectories.
find -name '*' -size +500M - Search for all files larger than 500MB.

du --max-depth=1 -h - List of folders with their sizes in current directory.
du -all --max-depth=1 -h - As above, but also include files.

tar -zcvf htdocs.tar.gz htdocs - compress htdocs directory
tar -zxvf htdocs.tar.gz - extract htdocs.tar.gz file
-z Compress using gzip
-c Create archive
-v Verbose
-f Archive File name
-x Extract files


- TCP/IP network interface parameters.

su - Become super user or another user.
sudo - Execute a command as the superuser or other user.

chmod -R 777 /folder - set 777 (full) permissions for folders

Startup scripts can be placed in rc.local
it could be in /etc or /etc/rc.d

apt-get install build-essential
- installs all common compilers at once

tail -f /var/log/file.log - Monitors a log file in a real time. All new added lines will be outputted on a display. To interrupt press CTRL + C


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