Failed deleting solution. Solution dependencies exist, cannot uninstall / Remove unmanaged layer– Dynamics 365 / Dataverse

Recently while trying to delete a managed solution from one of our environments, we got the below error.

Failed deleting solution MainManagedSolution. Solution dependencies exist, cannot uninstall.

Click on View Dependencies.

Click on See solution layers

We can see Active Contacts has a dependency on the custom column, and it is part of an unmanaged layer (default solution) in this case.

Click on Remove active customizations

This will delete the unmanaged customization done in the Active Contact view in the environment. (removes the custom column from the Active Contact view)

Trying again, this time we can delete the Managed solution.

Get more details – Remove an unmanaged layer

Hope it helps..