Symptom: You receive an error on Step 1 when deploying Lync:

Upload C:\Program Files\Microsoft Lync Server 2010\Deployment\Setup\BackCompatSchema.ldf fails. The exit code is “5″.

Solution: This issued popped up when I added myself to the schema admins group and then ran the deployment wizard. To fix this, I simply logged out and logged back into the machine and reran the wizard.