Hello,
I'm a beginner on Ultra96 with Petalinux v2018.2, 
I would like to install Xfce instead of Matchbox, and then use xfwm4 as 
x-window-manager and xfce4-session as x-session-manager .

There are several providers for x-session-manager: mini-x, Matchbox, Xfce, with 
various priorities.

In 
https://github.com/Xilinx/meta-petalinux/tree/master/recipes-xfce/xfce4-session 
you wrote:
Alternatives for x-session-manager have the same priority, and this
causes a do_rootfs warning.  We lower the priority for xfce4-session in
petalinux to resolve this.


Here are some priorities I found:

 - openembedded-core/meta/recipes-graphics
matchbox-session : 100,
matchbox-wm : not specified.

 - in openembedded-core/meta/recipes-graphics
 mini-x-session : 50.
 window manager : ?

 - in meta-openembedded/meta-xfce/recipes-xfce
xfce4-session : 100
xfwm4 : 30.

 - in meta-petalinux/recipes-xfce
xfce4-session : 90.


I'm not sure of the best way to give Xfce the highest priorities, and install 
correctly Xfce (x-window-manager and x-session-manager).

Here are my questions:
How should I set the priorities ? with ALTERNATIVE_PRIORITY or 
PREFFERED_PROVIDER ?
What is the best way to do that ? modify meta-petalinux configuration files or 
edit configurations in meta-user, local.conf ?
Is it editable with petalinux-config -c rootfs ?

Best regards
-- 
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