I was able to get mine working on Ubuntu 20.04 - pulling from the latest on Github, when I installed the following system packages things worked right away:

libgcc1
lib64stdc++6

I Grant,
Pleased to read that the topic is progressing positively!
I'm using Mint 20.2 that is based upon Ubuntu 20.04 (Focal Fossa). 'libgcc1' was natively installed but not 'lib64stdc++6'. So I did it manually (Synaptic package) for the latest, and rebooted the machine, in case.
Unfortunately it doesn't solve the issue in my case. Is their any other action that I could test ?
Have a good day!
Didier

In the comment linked below, user paolostivanin identified the shared object files which are required by the libraries:

github.com/indilib/indi-3rdparty/issues/...suecomment-926911217

I didn't have my original (problematic) configuration set up, so I created a new 20.04 machine, followed the build/installation instructions, and then tried to install the packages which provide these files. These were the only two which didn't show up as installed on my system, but there were others - go through those files and do a search to see if there are any other ones which you might not have by default. Also, it may help to rebuild/reinstall kstars/indi/libatik/indi-atik after grabbing these prerequisites.

Thanks for your advice. I'm doing my best to follow when it starts to be technical, but reaching my limits quickly.
Following the link you provided, I have been looking for the libraries that are marked as 'Needed'. I did that with my desktop, on which the filter wheel is recognized, and on my laptop, that I'm using with the telescope. Configurations are identical on both, but it is to be noticed that almost half of the libraries are missing.
In case, I re-installed INDI drivers and Kstars/Ekos. Unfortunately the problem remains.
Clear sky

My strategy was to search those libraries and find what packages supply them. For example:

packages.ubuntu.com/search?suite=xenial&...eywords=libgomp.so.1

From there, I tried to install one of each such package - in the sample above, this was libgomp1. If you haven't yet, I'd recommend re-trying that for all of the files mentioned in that post. If that doesn't work, try uninstalling and reinstalling kstars, indi, and the appropriate indi-3rdparty libraries.

Are you building the package from source?

Hello,
Are there any news regarding this issue ? I tried to follow all the suggestions given in this thread but I couldn't make the Atik Filter Wheel work with kstars.
Thanks for any help,

Dominique

Nope - I had it working very briefly, but wasn't able to replicate it and have tried a full rebuild on several occasions. I've fallen back on a poor workaround of running Ubuntu 18.04 in a virtual machine just to talk to the filter wheel.

I am updating the Atik INDI driver to 2021.11.02.862. I don't suppose it would change anything to the current state of support for the Filterwheel.

What is the identifier of the USB device (found with lsusb)? Is it 04d8:003f or something else?

Yep, that's the correct ID.

Hi. Have been away from Kstars/ Ekos for a while... But having seen a lot of updates regarding Kstars and Indi I took the time to re-test my astro-photo setup with Ekos.
And, very good news, every thing seems to connect and be controlled as expected !!
Well ... almost every thing: my imaging camera is well recognized, as well as my second camera that I use for guiding with OAG. BUT I cannot tell Ekos to use the second camera for guiding: it is taking guide images with my imaging camera... I just spent an hour trying to solve it, but I'm stuck.
I will open a dedicated topic to find help on this stupid issue.
Clear sky !

Use secondary train for guiding, make sure the camera selected there in your guide camera.

Many thanks Jasem ! This feature of multiple optical trains was not implemented last time I used Ekos. I found it, configured ... and it works !
Now I need to invest time to be as effective with Kstars/Ekos than I'm currently with N.I.N.A. It would be easier for me to stay within Linux, as my only use of Windows is to run NINA...