Error: 'The SELECT permission was denied on the object' or 'the EXECUTE permission was denied on the object'

Unable to log into the application due to the following error (after a upgrade):
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​An unexpected error occurred. Please report this problem to your system administrator with the following information:
System.Data.Sqlclient.Sqlexception: The SELECT permission was denied on the object 'Plugins'. database 'database_name', schema 'orc'.
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Cannot import data due to the following error message:
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​An unexpected error occurred. Please report this problem to your system administrator with the following information:
System.Data.Sqlclient.Sqlexception: The EXECUTE permission was denied on the object 'Populate_FM_OrcStaging'. database 'FMAST20', schema 'dbo'.

An unexpected error occurred. Please report this problem to your system administrator with the following information:
System.Data.Sqlclient.Sqlexception: The EXECUTE permission was denied on the object 'SFDCSyncFrom'. database 'Orc_Live', schema 'dbo'.

The functionality has been enhanced in Orchestrate version 7.76 hotfix 30 and Orchestrate version 7.77. Please upgrade to either of these versions or above.

If the error continues to occur, pease raise a new case online and reference the title of this article.