[Tex/LaTex] Image file not found

texstudio

I was developing a document in Latex using TexStudio that was installed in windows7 and now I want to continue in Ubuntu. I installed Latex in Ubuntu and compiled my same project but I got error 

! LaTeX Error: File `./DFKI_logo' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
...                                              

l.26 ...raphics[width=0.55\textwidth]{./DFKI_logo}
                                              ~\\[1cm]
I could not locate the file with any of these extensions:
.png,.pdf,.jpg,.mps,.jpeg,.jbig2,.jb2,.PNG,.PDF,.JPG,.JPEG,.JBIG2,.JB2,.eps
Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

Best Answer

If it was working in Windows 7 and stopped working under Ubuntu, most probably you have incorrect case in the name of the file. For example DFKI_logo.pdf and dfki_logo.pdf for Windows are the same (most of the time anyway), for Ubuntu they are not. Check if you have the file name correct including case of the letters.