In my experience it was checking the option depicted in the figure that triggered an error similar to yours... if you do not have filters... well, maybe at code level the problem is the same but is triggered somewhere else
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Hi Ronald, I thought of something similar in another thread. However, in the end it's already there: just set on 'loop' frame acquisition in the focus panel... and you get a graph of HFR (in pixel or arcsec, which in the end doesn't matter) "jumpiness" in real time. As John said just keep the acquisition short, ie around a second or so, to avoid guide/wind errors.
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My system is a fanless Celeron J4125, 16GB RAM, 1TB NVMe SSD running Ubuntu 22.04.3 LTS with Xfce Desktop Environment.
I use a 12V powered TP-Link UH720 HUB 3.0 USB hub to link cameras and other devices (QHY268M, QHY5III178M, QHYCFW3, HEQ5, Pegasus Focuscube).
Power is ensured by a Meanwell LRS-150-12 150W 12V transformer.
Right now I'm on the bleeding edge of both Indi, Indi3rdparty, Kstars etc... I have hiccups and error from time to time, but since I'm still perfecting my latest setup (switched from an "easy" 80mm Apo to a dreadful RC8), I do not mind much. In my opinion, the secret is that after you have a flawless configuration (if such a thing exists) in terms of equipment, the next step is to aim for maximum stability in the software and then STOP upgrading!!! At least until you decide that some additional features are necessary... or you want to make your life more difficult 
.
my two cents.
Best (and thanks again to Nou for making my life easier)
Massimo
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I've been using Nou's script to keep my scope PC running for at least three years. They are simple to use, rock robust, and frequently updated, ensuring that you have the best possible soft environment.
It's worth noting that the build-soft-stable.sh script allows you to alter the version of all installed components by just changing the first lines of code.
Thank you so much, Nou, for your efforts.
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I suggest you to try Nou’s scripts to build kstars and related paraphernalia on Ubuntu: gitea.nouspiro.space/nou/astro-soft-build
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Hello, John. I recently built and installed the latest release of Kstars 3.6.9 (huge thanks to Nou's scripts for that!) With your new focus algorithms... Great work! So far, everything works like a charm! I won't be able to test anymore these days (cloud, plus my mirrors are traveling to Venice for a re-aluminization), but thank you very much for your wonderful effort and dedication!
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Greater functionalities mean greater challenges. I'm always delighted by the joy and wrath that this generates ;-D
Let us also remember the old adage, "If it works, don't touch it!"
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Hi, maybe it's something else, but in my experience, since while and also in kstars 3.6.8, flat frames calibration does not function if you tick the "take flat frames at the same focus point" option in the filters panel.
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Yes, Alfred! I wasn't clear; what I'm suggesting is that the "average over" of the last datapoint of the first focus run could be skipped. I propose tu simply use the HFR value obtained by fitting the V-curve, basically the ordinate of the minimum of the curve, instead of measuring an average of the HFR value of the last datapoint. But I don't know if this is easier or harder because I don't know how the focusing algorithm works on the inside.
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