I followed the advice here on how to boot to tty1 rather than straight to graphical (that is, I followed the answer's instructions on how to default to the terminal you get when you hit Ctrl-Alt-F1).
However, sometimes I still later want to start a graphical session (that is, the thing you get when you Ctrl-Alt-F7).
I try typing startx or unity. However, though startx does load a graphical session, it does not load the full desktop environment. I notice for example I don't have any menu bars, or ability to move to multiple desktops. This suggests to me there is some other service (window manager maybe?) that is not appropriately starting under startx.
How can I launch a true x session subsequent to beginning in
GRUB_CMDLINE_LINUX_DEFAULT="text"
mode?