Event ID 20 — Windows Update installation failed

Windows Update did not manage to install an update

TopicIT resources → About 1 min read

Windows Update did not manage to install an update.

Source of event

Microsoft-Windows-WindowsUpdateClient — category Updates.

Possible causes

Disk space
Windows Update Components
C-Contributed
Error of the Service

Verifications to be carried out

Remove code of error
Identify KB
Control DISM/SFC and the disk space

Commands

Get-WinEvent -FilterHashtable @{LogName='System'; Id=20} -MaxEvents 30

Key takeaways

An Event ID must always be interpreted with its source, its full message, its timing and the context of the system. The same number may exist in several providers of events.