Harry Putnam wrote:
Setup: VBox vm running gentoo(amd64) guest on a win-10 (64bit) host
 Hardware: HP xw8600 - 2x Xeon  CPU X5450 @ 3.00GHz - 32 GB ram

LXDE on the menu item Preferences ===> Desktop Preferences
Nothing can be set there and it does not even show a dialog
box... just an error messages that says:

    Desktop manager is not active

All the lxde-base pkgs contained in lxde-meta are installed.

Openbox wm is installed.

Anyone know what that error message means or how to get around or fix
it?

Is pcmanfm running?

$ ps ax | grep pcmanfm
 2975 ?        Sl     0:00 pcmanfm --desktop --profile LXDE
 2982 ?        Sl     0:00 pcmanfm --desktop

If not, check if it specified in the lxsession configuration. On my system the (default) lxsession configuration file contains:

$ cat .config/lxsession/LXDE/autostart
@lxpanel --profile LXDE
@pcmanfm --desktop --profile LXDE
@xscreensaver -no-splash

You could also check the 'Autostart' tab in the 'Preferences->Default applications for LXSession' and verify that 'Disable autostarted applications' dropdown entry is set to 'No'. You reach the same config window by issuing:

$ lxsession-default-apps

raffaele

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