Anyway here is what I am seeing. When I turn on my laptop (Dell x86_64, not sure about model), I get a login screen. After entering my password, I get:
in a pop-up window which has one button `[okay]`.: unable to launch "cinnamon-session-cinnamon" X session
"cinnamon-session-cinnamon" not found; falling back to default session.
After clicking `[okay]`, I get an empty black screen, with a mouse cursor. The mouse cursor does move when I use the mouse pad. I tried various Alt and Ctrl combinations with other keys in an effort to bring up a menu to launch any application, without success.
I can get a console session via Alt-Shift-F2. I tried `lightdm --test-mode` and got "Failed to get D-Bus connection".
Also tried `sudo lightdm --test-mode` and got "Failed to use bus name org.freedesktop.DisplayManager, do you have appropriate permissions?".
Also `sudo lightdm` gives same result as `sudo lightdm --test-mode`.
In the console session, `ps x` shows that `x-window-manager` is running. Following the link to /etc/alternatives shows that's actually Metacity. I wonder if I can make use of this information somehow.
I wonder if I can launch some applications from the console. I tried `export DISPLAY=:0` and then `xclock` (just to verify that I can launch an X application). `xclock` is running but I don't see its display when I go back to the X session via Alt-Shift-F7.
Not sure where to go from here. Any advice will be greatly appreciated.