IM360 deploy script hangs at Reading package lists

Issue

The IM360/IMAV+ deploy script hangs at Reading package lists

Environment

• Imunify360
• ImunifyAV+
• Ubuntu/Debian (could happen on other supported OS)

Symptoms

1. After running "bash i360deploy.sh" it hangs at Reading package lists... 
   
2. Notable transfer staling mostly of times, check it trying to download a file from the repository, for example for ubuntu 20.04:

   https://repo.imunify360.cloudlinux.com/imunify360/ubuntu/20.04 

Solution

If the server is running both IPv4 and IPv6, try to force IPV4 preference, sometimes if the server has a dual-stack the issues may be on IPv6 routing only:

# Prefer IPv4 connections 
# precedence ::ffff:0:0/96 100

Alternatively, it's possible to force apt to use IPv4 temporarily and re-run the deploy script:

echo 'Acquire::ForceIPv4 "true";' | sudo tee /etc/apt/apt.conf.d/99force-ipv4

Cause

The installation requires more time than usual, it seems it hangs nonetheless data is being downloaded from the repository at a slow rate.

It may be a temporary intermediate routing issue likely due to BGP peering session changes, anyway it becomes normal as soon as getting a better as-path. Other causes may be local connectivity issues eg cables, interface, internal routing, or limited bandwidth so it's worth double-checking them over there as well.