I freshly installed Debian 9.0 with Cinnamon and for some reason I can only open the root terminal once (after I start up the PC).
When I try to open it up a second time it doesn't show: when I press OK after entering the correct administrative password the screen just shortly flickers black and nothing happens (besides the password-window getting closed of course). It also flickers black when I press cancel without entering anything.
I have "Remember password" unchecked (albeit having had it checked once).
Edit: this might be relevant - earlier (maybe due to having it checked once) I once got this message when opening up Synaptic:
The '/usr/bin/x-terminal-emulator' program was started with the privileges of the root user without the need to ask for a password, due to your system's authentication mechanism setup.
It is possible that you are being allowed to run specific programs as user root without the need for a password, or that the password is cached.
This is not a problem report; it's simply a notification to make sure you are aware of this.
Edit: I'm new to Linux so I'm not sure which logfiles I should look into and what to look for. When I try to open the root terminal a 2nd time I get this in
Successful su for root by myuser + /dev/pts/1 myuser:root pam_unix(su:session): session opened for user root by (uid=1000) pam_systemd(su:session): Cannot create session: Already running in a session pam_unix(su:session): session closed for user root
I closed the root terminal before that by pressing its X close button.
With "Root Terminal" I'm referring to that shortcut with the red screen as icon. The usual terminal works just fine (with