Hello Jasem and Sterne-Jaeger,
thank you! I found the following post in the forum:

indilib.org/forum/search.html?query=/etc...ault/t&childforums=1

The solution described there worked for me to connect to the lodestar guider cam, but it made pop up another issue, I thought I had already solved:

As soon as I connect to my ASI 294mc via USB3, the WiFi-HotSpot of my Intel ComputeStick (Ubuntu Mate 16.04) crashes. That is a problem because I control kstars / indi remotely with Teamviewer, using the HotSpot wifi-connection.

Before I made the changes in the /etc/default/tlp according to the above post, I had solved this issue by forcing the HotSpot to 2.4GHz. Now the problem is back ...
When I connect via USB2, everything works fine now. I am not sure, if I should try to get the ASI-cam work with USB3, since there are statements on the web that state that for this ASI-cam the image quality was affected by the usb-standard. They say the amp-glow in the dark (and light) frames was more pronounced with usb2, which I could confirm in tests. I‘ll have to investigate how far the image quality of actual images is affected / if it is ok with USB2.

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