Updated Ubuntu troubleshooting

Author: osy

guides/ubuntu.md

@@ -59,7 +59,7 @@ If the hardware enumeration order changes, your network settings may need to be
 2. Edit `/etc/netplan/00-installer-config.yaml` and copy your configuration for `enp0s8` (or whatever the old adapter was named) and paste it immediately after for `enp0s1` (or whatever the new adapter is named).
 3. Reboot and you should be able to use networking again.
 
-### Black screen during boot
+### Black screen or stuck during boot for a long period
 On ARM64 it has been reported that doing this may enable two wait services: NetworkManager-wait-online.service and systemd-networkd-wait-online.service that causes a black screen at boot.
 To verify the fix is needed one can run: