Untrusted Application Launcher

Solution 1:

• Open a terminal with Ctrl + Alt +T then run this command:

  cd ~/Desktop
  sudo chmod +x sublime_text.desktop
  

  Change Desktop to whatever your desktop is called in your language. chmod is a command line command to change permissions, +x make it executable

• or instead you can run:

  cd ~/Desktop
  sudo chown yourusername sublime_text.desktop
  

  chown is command line command to change file owner

Solution 2:

1. Open a terminal with ctrl+alt+T and type in the terminal: gksu nautilus

2. Enter your password when prompted and your file browser should emerge.

   This will make you root until you close the file browsing window, which is necessary to edit the file (as you can see that only "root" has permission.

3. In here navigate to the file you want to edit. Now you can set the file to execute as program.

Be advised to use gksu with extreme caution. Everything you delete will be deleted permanently. Making changes to the wrong files is really easy this way and could leave you with an unusable system!

This is AFAIK about getting ownership of a file that belongs to Root