Linux software says A Photo Tool (Libre) is installed but I am unable to locate it. It also says Source Snap Store which I am unfamiliar with. I would appreciate any help with this because I would like to use the program.

I use gwenview for the fairly simple photo editing that I do.

The full scale bells and whistles photo editor is gimp. I have used gimp several times but it is so complex that I use gwenview whenever possible rather than spending the time learning how to get gimp to do what I want.

This link describes how to install A Photo Tool.

https://snapcraft.io/install/aphototoollibre/ubuntu

There is also gimp and many other image editors available.

Me too. In fact, it is about all we use as the normal crop, resize, rotate functions are present. And I stay away from using snap if all possible ...

XnView Multi Platform, is the best combination viewer and editor I have used. The GIMP I use for more complex photo editing.

XnView MP (free for personal use), https://www.xnview.com/en/

The GNU Image Manipulation Program (GIMP), https://www.gimp.org/

Gwenview is a KDE application. I used it to view an image and The GIMP to edit an image, but now find XnView does almost everything I need in a photo editor.

Holy macro. I figured I'll try gwenview and it wants to install 53 new packages as dependencies, among these are udisks, polkit and elongind. It wants to turn my little lean clean system into bloated. I don't think I need a photo editor which relies on udisks and co.

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This is a great website on using the GIMP: https://meetthegimp.org/

One of main problems I've encountered in using the GIMP (and similar programs) is the terminology. Persons who manipulate images professionally have their own terminology, which does not necessarily meet with how the--er--uninitiated would use the same terms. After I watched the first six videos at meetthegimp, my friends thought I was a magician.

My second choice for image editing is Kolourpaint.

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Another editor is Fotoxx, this too has its own DNA. I can find my way in GIMP, after so many years of occasional usage. In Fotoxx I'm lost. Big way. I think it is a good editor ... maybe.

This is exact.
I “thought” I was “using” The Gimp for “Photo manipulations” until I bought the book of a journalist who described his way of working with photos – as a professional – and the facilitation that The Gimp allowed.

A lucky moment. The guy had been harshly criticized for his way of explaining (that I found great) and the fact that sample pictures were missing (to what purpose).

Experts are a problem.
I hope to have stopped being one in anything.

You are using Ubuntu, so you want something that Ubuntu provides and that works with your Gnome GUI. As Emerson pointed out, however good Gwenview might be, it's a KDE program and so will want to install a lot of extra stuff on a Gnome system. If you are a bit hazy on adding software to Ubuntu, look here. The Software Centre will let you search for a photo/picture editor. GIMP is very good, but it does take a lot of getting used to — it's comparable to Photoshop Elements, I believe.

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JDWheel,

Open Terminal and type:

Press Enter.

In case it's not obvious, "A Photo Tool (Libre)" is the stupid name for a piece of software which offers:
The question asked was how to locate already installed software (although it's not clear if it was actually installed?) and nobody has answered that.

Last time I used Gnome it was a case of pressing the Super key and typing the name. I would assume it to still be that simple, but no idea if Ubuntu/Gnome may have changed it. (Or maybe Snaps don't add themselves there?)

In any case, there's no reason to use such a crude tool when other well-tested ones exist.

Again, I'm unaware of what Ubuntu/Gnome currently includes by default, but one of Gnome Photos, gThumb or Shotwell will likely be equivalent to KDE's Gwenview and do what is desired.

There's also a list of photography-related software at pixls.us/software

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Thank s to all for your help.