Q:

While installing Sitecore 9, the SOLR schema is not updated

When trying to install Sitecore 9, I am getting the following error :
[UpdateSolrSchema]:[Authenticating] http://habitat9.sc/sitecore/admin/PopulateManagedSchema.aspx?indexes=all
Install-SitecoreConfiguration : Error requesting http://habitat9.sc/sitecore/admin/PopulateManagedSchema.aspx?indexes=all: The operation has timed out.
At C:\SW\OneDrive_2018-07-02\sitecore9\SIFLess\SIFless-EZ-1531118582.ps1:67 char:1
+ Install-SitecoreConfiguration @sitecoreParams
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Install-SitecoreConfiguration
We observed the siteore-XP0.json:
"UpdateSolrSchema": {
            // Update the solr schemas.
            "Type": "SitecoreUrl",
            "Params": {
                "SitecoreInstanceRoot": "[concat('http://', parameter('SiteName'))]",
                "SitecoreActionPath": "sitecore/admin/PopulateManagedSchema.aspx?indexes=all",
                "UserName": "admin",
                "Password": "[parameter('SitecoreAdminPassword')]"
            }
This script is executed but I don't know where we were missing some steps. 

A:

Please follow the below steps and try:-
The correct procedure is:

Log in to Sitecore => go to Control Panel

Click to "Populate Solr Managed Schema"
Then click to "Deploy marketing definitions"
Then click to "Indexing manager"
And finally click to "Rebuild link databases"

