Why wiki pages shows different information dependent path you came.
For example:
on tab1 open page: https://wiki.luckfox.com/Luckfox-Pico/Luckfox-Pico-LVGL/
on tab2 open page: https://wiki.luckfox.com/Luckfox-Pico/Luckfox-Pico-Flash-burn-image/ when press " LVGL User Guide " on the left table of ...

I've just started with LuckFox ProMax and install ubuntu.
I've met same promblem. gcc fails to link any c/c++ code.
So I make quick fix for this problem:

#!/bin/sh

# run on device in user's home dir /home/pico
#
# bash luckfox-gcc-fix.sh
#

# view contents:
# https://packages.debian.org/sid/armhf ...