I have installed many different linux distros and wound up with Ubuntu on my desktop and KUbuntu on my laptop (which controls a coffee roaster). I had some success downloading stock quotes in KMM with Ubuntu but for the last few weeks I get the standard "Failed to retrieve..." and "Unable to create io-slave. Can not find 'kioslave' executable at ..."
On a lark I tried it on Kubuntu and it worked perfectly. Is that to be expected? Thanks. and again, thanks from helping me escape the other "Intuitive" financial program.
JP

Assuming both Ubuntu and Kubuntu systems are the same exact release (20.04, 21.04 etc), they would then be using the same exact KMM package, since they both share software repositories.

What you see here could be caused by a packaging bug, with some important dependency missing that Kubuntu already has, but has been accidentally left out. Something related to kio-slaves, I'd wager.

So it might be a bug on Kubuntu's part, possibly.

Using a self-contained appimage might be worth trying, as it would have all that built in.

Thanks for the response. I am using the latest appimage (9/28 I believe: KMyMoney-5.1.2-cb0b492-x86_64.AppImage 226.15 MB) on both machines. And both running 21.04. But, it may be, as you say, that Ubuntu is missing some kio-slave dependency. In any case, I will install Kubuntu on the desktop. JP

The kio-slave missing in AppImage problem is a known issue but apparently no-one came around to fix it (yet).

Ok, that's it. I never suspected that the AppImages would not be complete. When I installed through "sudo apt install kmymoney", the downloads work perfectly well in Ubuntu. My bad!