How to fix NetworkManager:2504 error in Ubuntu?

Question

linux

Here is the whole error: (NetworkManager:2504): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.
I searched the Internet for a similar error, but did not find it. But because of this error, when booting, it says something like this - 'Boot without full ... Networking'. Due to this error, I cannot manage the network functionality.
Help is very necessary.

Answer 1

delete or comment out /etc/network/interfaces all lines except the first two
auto lo
iface lo inet loopback
and reboot