Session lasts less than 10 seconds. There is some problem with your ThinLinc system. Please contact your system administartor

[aaron]

Hi @lifeisbinary, welcome to the forum.

I can’t find any clues in the log file, are you sure this is the entire file? In general Ubuntu 18.04 is quite old now. This should not affect ThinLinc in theory, but it’s unlikely that it has been tested on this distribution for some time. If you’re unable to upgrade to a more recent version, perhaps you could try using a more lightweight desktop environment, such as MATE or XFCE. For more information about which desktop enviroments to use in ThinLinc, see:

Which desktop environment should I use with ThinLinc?

ThinLinc supports multiple desktop environments (DEs) through its profile chooser functionality. Where multiple desktop environments (or profiles) are made available by the administrator, users may be presented with a choice during login. Which profiles, if any, the user gets to choose from will depend on certain conditions determined by the administrator. Each profile may provide a different desktop environment, or perhaps even different configurations of the same desktop environment, each suit…

Let me know if this helps.