LaTeX: How to add vertical bar with evaluation or limit

$$\frac{\partial f}{\partial x\partial y}\bigg\vert_{x=y=0}$$

Ubuntu: Missing Date and Time (Clock) in the Indicator Bar

sudo apt-get install indicator-datetime
sudo dpkg-reconfigure --frontend noninteractive tzdata
killall unity-panel-service

Disable Blogger Navbar

Follow this steps to disable the Blogger Navbar:

1. Click on Layout link.
2. Look for the Navbar text and click on the Edit link.
3. When the pop-up window appears, scroll down and select Off, then click on Save button.
4. Finally, click on Save arrangement button.

GIMP: Missing toolbar

In order to restore the missing toolbar for GIMP, locate and delete the "sessionrc" file in GIMP profile.

Where is the GIMP profile?

• Windows XP: C:\Documents and Settings\your_username\.gimp-2.8
• Vista and Windows 7: C:\Users\your_username\.gimp-2.8
• Linux: /home/your_username/.gimp-2.8/

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