Ubuntu has always been working fine, I was just switching on my computer as usual and suddenly the screen for gnu grub version 1.99-12ubuntu5 appears even though I am not installing ubuntu.
the following options provided:
Ubuntu, with linux 3.0.0-1-generic
Ubuntu, with linux 3.0.0-1-generic (recovery mode)
Previous Linux versions
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)
they are asking me to select which OS I would like to boot but I am so confused. Please tell me what to do to escape and still protect my files (in my computer) from being deleted.