No Themes after WSS 3 to SharePoint 2010 Attach DB Migration

After successfully migrating from WSS 3 to SharePoint 2010 using the attach DB method, when we try to access and change Themes we get this error:

An unexpected error has occurred.

Troubleshoot issues with Microsoft SharePoint Foundation.

Correlation ID: 0b897ff6-dd0b-4dcf-9693-22a07eacb12d

Date and Time: 8/28/2015 8:54:14 AM
Freda Driscoll-SbarDirector of System OperationsAsked:
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Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
It appears to only be with the new SharePoint 2010 "Home" root/page. Other sites appear to have retained the original theme colors from WSS 3. However, I need to resolve this in order to change the theme on all sites.
Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
I just noticed that under Site Settings\Galleries there is no Themes option, which is required to import and work with new themes. How do I get this created?
Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
I resolved it myself after MUCH research;

1. Removed content database from web application
2. Re-restored WSS 3 SQL Bak into new DB
3. Executed:
Mount-SPContentDatabase "SharePoint2010" -DatabaseServer "sqlservername" -WebApplication http://servername-Updateuserexperience

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4. All sites look good and Themes are now available with new user experience/visual upgrade.

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Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
Resolved it myself.
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