SharePoint Solution Deployment stucks in Retract / Deploy State

Problem Description:

I tried to deploy / retract a solution on a SharePoint farm, but the process never finishes. It stucked in “Deploying / Retracting” state forever.
In my case this was caused by disabled timer service instances.

Workaround:

I deployed the solutions with the parameter -Local on each server.

Final Solution:

$farm = Get-SPFarm
$disabledTimers = $farm.TimerService.Instances | where {$_.Status -ne “Online”}
foreach ($timer in $disabledTimers)
{
$timer.Status = [Microsoft.SharePoint.Administration.SPObjectStatus]::Online
$timer.Update()
}

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