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FBturbo failing with undefined symbol

in the system log this appears:


xinit[948]: /usr/lib/xorg/Xorg: symbol lookup error: /usr/lib/xorg/modules/drivers/ undefined symbol: shadowUpdatePackedWeak

Your system doesn't seem compatible with the FBturbo driver that you have installed

Remove the fbturbo driver

sudo apt purge xserver-xorg-video-fbturbo

make sure the config is removed:

sudo rm /usr/share/X11/xorg.conf.d/99-fbturbo.conf