It’s a little unclear what error is coming from what application. If multiple applications are complaining about the data, check the data.
But first, I did not know what Corel AfterShots 3 was, so I did:
pamac search aftershot
pamac info aftershotpro3
It is a AUR package. I clicked on the URL given in the output. It appears not to be Open Source.
I’ll only speak regarding gimp.
@Aragorn recommendation is addressing the error message which says, “not a JPEG file”. In the linux world, one way for a user to confirm that a file is a particular type is to use the
file --mime myImage.jpg
Should return something like:
myImage.jpg: image/jpeg; charset=binary
If you have imagemagick installed you can use identify.
Confirm your data (in this case your jpg file) is good.
Is the device mounted? Can you browse to the directory?
How did you open the jpg file? I’ll assume the menu item File-Open was used and that you clicked some Place in the left side and selected the jpg in the right side. Is this when the error occurred?
Start gimp from the command line, by just typing
gimp. Any errors related to missing plugins?
If no error, start gimp from the command line with the file name, either change directory to the directory containing the jpg or use the absolute filename. Was the file opened successfully?
You can also drag and drop an image in gimp. Start gimp. You mentioned XFCE. I assume you are using Thunar. Open Thunar and drill-down to the location of your jpg file. Click the filename and hold and drag to gimp. Did it open successfully?
Also in Thunar, you can right-click the jpg filename and select “Open With” “GNU Image Manipulation Program”. Thunar should also show the MIME Type, if you are displaying that column (View > Configure Columns).