Teamviewer was updated on my PC to v13. I have one person who needs to connect who uses Ubuntu. When he tries to connect he receives an error that he needs to upgrade from v12 to v13. Problem is there is no v13 for Linux that we can see.
He also attempted to use the web client to log in from within the TV account here online. Unfortunately, that does not work either as when he attempts to connect he gets a message stating that the session is finished. Reading the log shows the following: