How to fix `cPanel does not support NetworkManager enabled`

When installing cPanel, you might run into the following situation:

2019-06-14 22:24:26 722 [18497] (ERROR): ********************* ERROR *********************
2019-06-14 22:24:26 723 [18497] (ERROR): NetworkManager is installed and running, or 
2019-06-14 22:24:26 724 [18497] (ERROR): configured to startup. 
2019-06-14 22:24:26 725 [18497] (ERROR): 
2019-06-14 22:24:26 726 [18497] (ERROR): cPanel does not support NetworkManager enabled 
2019-06-14 22:24:26 727 [18497] (ERROR): systems. The installation cannot proceed. 
2019-06-14 22:24:26 728 [18497] (ERROR): 
2019-06-14 22:24:26 729 [18497] (ERROR): See https://go.cpanel.net/disablenm for more 
2019-06-14 22:24:26 730 [18497] (ERROR): information on disabling Network Manager. 
2019-06-14 22:24:26 731 [18497] (ERROR): ********************* ERROR *********************
2019-06-14 22:24:26 732 [18497] (FATAL): Exiting...

You need to disable the network manager service.

cd /etc/sysconfig/network-scripts

Edit both ifcfg-eth0 and ifcfg-lo and add this: