If a jpg is added to backgrounds, when the system is restarted, the added jpg is removed from the file.
All updates are complete as at 2021/08/07
Your question is unclear. Do you mean that the jpg is not in /usr/share/backgrounds/?
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yes, only the backgrounds originally presented in the display in control center/appearance -backgrounds tab remained after a restart. [were displayed after a restart] Before the restart the jpg appeared in the appearance/backgrounds tab and the screen as the background. After a restart the jpg is gone from both.
I've used jpg's often in the past as backgrounds.
I agree is this the boot background, login background, the wallpaper, or something else?
Not sure what it's called, but it appears if the icon at the bottom left of the screen [click here to hide all windows] is pressed.
OK, then what you're talking about is the desktop wallpaper.
Did you copy the background image to /usr/share/backgrounds and then select the copy of the image in /usr/share/backgrounds, or did you select a background stored somewhere else?
If the background is stored somewhere else, ensure the background is not stored on a removable device which is not inserted when you log in. The MATE desktop needs the image to be available when you log in. If the image file is on a removable device, copy it to some place in your home folder, perhaps your Pictures folder. Re-set the desktop background to the one of your choosing (this time select the one in your Pictures folder, though!), log out, and log back in, and see if you can keep the desktop background this time.
Finally, when you set the desktop background, log out, log back in, and the desktop "forgets" which background you set: What wallpaper / color pattern does the desktop show instead? Is it the default Ubuntu MATE wallpaper? A solid color? A gradient that you set for your custom wallpaper? This is important to know -- the former would suggest that your desktop configuration database is somehow corrupt, whereas the latter would indicate the background image couldn't be read for one reason or another.
I hope to hear more about this issue.
Thank you for the clear reply geared to a user, semi computer literate but getting old.
Putting the image in 'pictures' and adding to 'backgrounds' from there, worked.
In other words the 'add' tab on backgrounds does not copy the image but only the path for
images already in the PC? Internal drives not mounted at boot will thus not be seen by backgrounds.
If I use terminal and copy the jpg image to /usr/share/backgrounds will that work - just yes or no.
Thanks again.
Raymond Pitts
Yes. But since posts must be at least 20 characters, I have to include this second sentence 
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