my phone showes this messege on screen

[Android Central Question]

/home/acer/Desktop/Screenshot_20180313-205709.png

 

[Rukbat]

That's the 'unambiguous file name' - it's the name of a file including its path from the root of the storage device. You evidently took a screenshot and the filename of that screenshot is showing on the screen for some reason. Are you sure you're not looking at the picture, not the homescreen, and used a stamping app to put the screenshot's filename on it?