Thanks for your notice freemangordon. I did not update anything intentionally. Should I have to run the same commands as mentioned by you or in this order?: dpkg -l grep microb dpkg -l grep libpng dpkg -l grep zlib I am asking this bcos I could not see the symbol "|" in my N900 Kbd. I tried dpkg -l, it listed. But when I tried grep microb, x-term looks as if it is waiting for some kbd input. Got Confused...! Thnaks in advance.