Unable to install the 360 Monitoring agent: integer expression expected

Symptoms

• The installation of the 360 Monitoring agent fails with the error on Ubuntu 16.04:

  CONFIG_TEXT: agent360.sh: line 722: [: Installer exited with error code 0. See agent360.log for details.: integer expression expected

  The log /var/log/agent360.log contains the line:

  CONFIG_TEXT: agent360.sh: line 170: apt-get upgrade returned error code 100. Please see agent360.log for details.: command not found

• On CentOS 6, the installation fails with the following messages:

  CONFIG_TEXT: Searching for agent360
  Reading https://pypi.python.org/simple/agent360/
  Couldn't find index page for 'agent360' (maybe misspelled?)
  Scanning index of all packages (this may take a while)
  Reading https://pypi.python.org/simple/
  No local packages or download links found for agent360
  error: Could not find suitable distribution for Requirement.parse('agent360')
  Searching for netifaces
  Reading https://pypi.python.org/simple/netifaces/
  Couldn't find index page for 'netifaces' (maybe misspelled?)
  Scanning index of all packages (this may take a while)
  Reading https://pypi.python.org/simple/
  No local packages or download links found for netifaces
  error: Could not find suitable distribution for Requirement.parse('netifaces')
  Searching for psutil
  Reading https://pypi.python.org/simple/psutil/
  Couldn't find index page for 'psutil' (maybe misspelled?)
  Scanning index of all packages (this may take a while)
  Reading https://pypi.python.org/simple/
  No local packages or download links found for psutil
  error: Could not find suitable distribution for Requirement.parse('psutil')
  Generating a server id ...
  agent360.sh: line 920: hello360: command not found
  which: no agent360 in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/bin/)

Cause

The OS installed on the server reached its End-Of-Life period so the vendor stopped providing updates for it.

Resolution

Upgrade the OS (e.g. by using this guide on a Plesk server) or move the data to a server with a newer OS (migration guide for Plesk might be found here).