Searching file using search box can be tedious or utterly slow, you can search any file on your hard-drive using following command.
I had to seach image named “IMG_7961.JPG" I used following command on terminal
$ tree -f / | grep IMG_7961
│ │ │ │ ├── /media/conquistador/Data/recovered data/IMG_7961.JPG
│ │ │ │ │ ├── /media/conquistador/Data1/20181028 Ghorwadeshwar/converted/IMG_7961.jpg
│ │ │ │ │ ├── /media/conquistador/Data1/20181028 Ghorwadeshwar/converted/IMG_7961.jpg.out.pp3
│ │ │ │ ├── /media/conquistador/Data1/20181028 Ghorwadeshwar/IMG_7961.JPG
│ │ │ │ ├── /media/conquistador/Data1/20181028 Ghorwadeshwar/IMG_7961.JPG.pp3
│ │ │ │ ├── /media/conquistador/PRAVINDSLR/DCIM/100CANON/IMG_7961.CR2
│ │ │ │ ├── /media/conquistador/PRAVINDSLR/DCIM/100CANON/IMG_7961.JPG