Thanks for taking the time to report your issue and help improve Ubuntu.
The reason it does this is because "function" is a bash-ism and /bin/sh
on debian/ubuntu is dash, which is a lighter, more posixly strict bourne
shell.

If you prefix your script with #!/bin/bash like so:

  #!/bin/bash
  function dummyfn ()
  {
        echo This is a dummy message, displayed by a dummy.
  }
  dummyfn

then it will work correctly, or you can use the non bash-centric form of
function declarations by just doing:

  #!/bin/sh
  dummyfn ()
  {
        echo This is a dummy message, displayed by a dummy.
  }
  dummyfn

Closing as not a bug.

** Changed in: bash (Ubuntu)
       Status: New => Invalid

-- 
Any function definition makes bash crash
https://bugs.launchpad.net/bugs/368800
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