Hi@akhtar,
There may be lots of reason behind this. Follow the bellow given steps to troubleshoot your network issue.
- 
Remove your network adapter and re-add it in your VM settings. 
- 
Run systemctl restart network 
- 
Run systemctl restart NetworkManager 
- 
Run nmcli connection up 'adapter name'  
- 
If eth0 doesn’t show any IPv4 addresses yet, run dhclient. 
If all the steps will not work, then reboot your system.