I'm running Ubuntu 14.04. I generally have the unity launcher in auto-hide mode. Problem starts if the desktop has been locked and then unlocked. Then the unity launcher does not disappear again.
Avoid holding down the Super button.
When locking the screen with Super + L the Super key is normally held down before pressing Super. But holding down Super is in itself a shortcut to get the Shortcut Help Screen up. By using this to lock the computer, you make the sidebar reveal itself before it's "interrupted" by the screen locking. This is the reason why using Alt+Ctrl+L does not produce the same effect: none of those keys have any effect on the sidebar, dash or the Help screen.
Either rapidly tap Super+L simultaneously (DO NOT HOLD DOWN
Super), use Alt+Ctrl+L or find a way to remove the Super shortcuts for the Dash/Sidebar.
EDIT: Also found that if your sidebar gets stuck, you can tap Super twice to get rid of it.
You may have triggered the four-finger multi-touch command for revealing the launcher. Try swiping four fingers to the left.
Found completely by accident.
I solve it by changing the button with CCSM (CompizConfig Settings Manager):
If not already done, install
compizconfig-settings-managerwith the following command:
sudo apt-get install compizconfig-settings-manager
Select "Desktop" -> "Ubuntu Unity Plugin" -> "Launcher"
Turn the "Hide Launcher" from "
Never" to "
This is considered a fixed bug and is resolved by Unity 7.2.2+14.04.20140714-0ubuntu1. The following command will bring you to the latest version. You may need to log out and back causing unity to restart to see the resolution.
sudo apt-get upgrade unity
Here is the official bug report: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1320438
i had this problem ! you have to move mouse cursor to left top and press rightClick mouse + leftclick mouse and drag to center left . hope work it for you ;)