I installed the Toolbox on Linux several times now,following the official instruction, and I also tried the script that's mentioned on the installation page.
Every time I start the Toolbox, it behaves if it is just installed with the Welcome screen. It also does not remember the login.
But the most serious issue is that nothing can be installed. 'Failed to install <TOOLNAME>, it says, and after that: unknow error.
What is wrong?