I recently installed Arduino 1.8.19 onto a computer running Linux Ubunto
I am new to Linux and had some trouble but did manage to get it installed but all the files show that I have version 1.8.19 like I downloaded but the IDE opens as version 1.8.15. Is this maybe on purpose because 1.8.15 is stable on Linux or should I reinstall ?
Please describe how you opened the Arduino IDE.
I doubt it. More likely you have multiple versions of the IDE installed and the one you are starting is different from the Arduino IDE 1.8.19 installation.
What was your install procedure and how are you launching the Arduino IDE?
It sounds like you have both versions installed on the computer and the links (presumably from the graphical desktop) are such that it is finding the 1.8.15 version.
If you know where the newer version is installed, you should be able to use the command line to go to that directory and "./arduino" will run the version in that install path.
OK thanks, I don't remember ever having installed it before and when I list all the files (there are lots! ) everything says 1.8.19 and didn't see anything that says 1.8.15 but I think I will start over, Thanks! 
Yes, using ./arduino worked! It now shows the proper version. I'll try to figure out where the older version is hiding and delete those files. I guess I'm getting some Linux learning! 
Should I be able to generate a new desktop/app icon from within Linux?
It goes back to my previous question. But you can try running this command:
which arduino
That will tell you the path of the arduino executable if it is present in one of the locations defined in your PATH environment variable. This is different from ./arduino which will execute the file located in the current working directory.
There is a good chance 1.8.15 was installed via some package manager like SnapCraft. You can also use that tool to uninstall it.
In theory you can get it by runing ./install.sh
Unfortunately, people seem to have a lot of problems with that installation script. I have never bothered with it myself. I'm happy enough to just run the IDE directly. I usually have multiple versions of the IDE installed for normal and beta testing purposes so it wouldn't be of much value to me anyway.
I don't have a recent version Ubuntu machine at hand, but there's probably a way to change where the Desktop GUI is pointing, but I don't use the Gnome desktop and didn't find directions in a quick internet search.
There's probably also a soft link for user installed apps, maybe in /usr/bin that points to the active version and that could be changed to point to the updated version.
I use an XUbuntu machine for Arduino and I just use the command line approach described above. This allows one to have multiple versions of the Arduino IDE installed.
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