systemd: lightdm.service: Main process exited, code=exited, status=1/FAILURE

[Mario Marietto]

Hello to everyone.

I've upgraded Ubuntu 18.04 to 20.04 on my ARM (32 bit armhf) Chromebook.
While Ubuntu 18.04 works perfectly,Ubuntu 20.04 has some kind of problem. I
think that during the upgrade something was broken.

I've added these lines in rc.local :

/usr/bin/dmesg > /home/linux/log1
journalctl --boot --no-pager > /home/linux/log2
echo > /home/linux/ciao
exit 0

what happens :

log1 file : has been generated,but it is empty

log2 file : https://pastebin.ubuntu.com/p/QZMygg8cjP/

3) file ciao is generated

On the log that I've pasted on pastebin I can see clearly where the error
is,but I don't understand what's broken and the reason.

Anyway,the problem is that I see what happens on the screen when it loads
the kernel and its variables,but when it has finished,I don't see the xfce
login screen because the screen turns off at some point. I can't ping the
machine,I can't do anything.

Please help me to fix the problem,thanks.

-- 
Mario.
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