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A few days ago, I installed some updates for my Ubuntu. Afterwards, I wanted to restart it but it told me that the operating system was not found.

Then, I downloaded Ubuntu 13.04....and I could delete the old version and install the new one. But as soon as I take out the stick, it will show me the messages again: operating system not found.

I have alredy deleted the old operating system. Do I have to do something in the BIOS?

It is a Lenovo laptop.

What can I do?

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Well, that question is a little vague, but your reference to a "stick" makes me wonder if you installed to a USB drive instead of the hard drive. If not, you might not have installed/configured the bootloader. –  Wutaz Sep 16 '13 at 20:48
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