Problem: Using the default APT update source of Proxmox VE, after clicking Refresh in the WEB management panel update, an error will be displayed:

 TASK ERROR: command 'apt-get update' failed: exit code 100

usage method:
(1) Back up the original sources.list

 cp /etc/apt/sources.list /etc/apt/sources.list.bak

(2) Replace the contents of sources.list with the following official non subscription sources

Non official source:

 deb  http://ftp.debian.org/debian  buster main contrib deb  http://ftp.debian.org/debian  buster-updates main contrib # PVE pve-no-subscription repository provided by proxmox.com, # NOT recommended for production use deb  http://download.proxmox.com/debian/pve  buster pve-no-subscription # security updates deb  http://security.debian.org  buster/updates main contrib

(3) Note the source address in/etc/opt/sources.list.d/pve-enterprise.list

 # deb  https://enterprise.proxmox.com/debian/pve  buster pve-enterpris

(4) Perform Update

 apt-get update

Copyright: Eric Qiu*

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