Hi,
we are sorry about this issue. We reverted back yesterday tk-framework-desktopstartup v2.1.2 release.
Can you please ask people who has the issue to delete their local install cache folder of tk-framework-desktopstatup and restart SG Desktop? It should be fine after that.
Here is the folder path: /home/[username]/.shotgun/desktop/install/app_store/tk-framework-desktopstartup/v2.1.2/