I recently installed Xubuntu 14.04 on a fresh machine and upgraded
another from 13.10 -> 14.04. This issue appeared on the upgraded machine
but the fresh install was totally fine.

The time it takes to login was extended and the display flickered for a
second several times. No window manager after login, windows launched in
top-left corner, focus follows mouse. Some applications (like Firefox)
steal mouse focus regardless so Alt+F2 or a terminal wouldn't accept
typing input until those apps were closed.

Launching `xfwm4` was enough to restore normality. I could close the
terminal (no trailing ` &`) and xfwm4 continued running.

I tried to fix it by adding `xfwm4` to my start-up list via Settings
Manager > Session and Startup > Application Autostart. After logging in,
I could see the window manager start initially but it was closed several
seconds later. My `.xsession-errors` file would only have these five
lines:

    openConnection: connect: No such file or directory
    cannot connect to brltty at :0
    Script for ibus started at run_im.
    Script for auto started at run_im.
    Script for default started at run_im.

Ultimately I fixed this issue by deleting ~/.cache/sessions/. Sorry I
didn't think to rename it, then work backwards to find the offending
file.

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https://bugs.launchpad.net/bugs/495361

Title:
  [Xubuntu] No window manager at startup

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