1/ 
Finally fixed my 99% sync issue. 

Follow this guide if you have the below issues:
- If your sync level is 99% or less.
- No peers or incoming gossip connections.

1) Allow port number 2282 & 2833.

Use the following Linux commands: 

sudo ufw allow 2822
sudo ufw allow 2833

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2/
Use the following Linux command to check if your ports are in LISTEN state. 

sudo netstat -tunpl

If your ports are open and in LISTEN state, follow the next command to restart the hubble.