ONTAP Select: Deploy upgrade fails with "Failed to stop scst.service: Unit scst.service not loaded" error

Applies to

• ONTAP Select Deploy 9.6, 9.7
• ONTAP Select (OTS)
• scst service

Issue

• During the upgrade of ONTAP Select Deploy upgrade fails with the following error:

ontapdeploy_asup/upgrade.log
[2020-10-09 07:20:25] + systemctl stop scst
[2020-10-09 07:20:25] Failed to stop scst.service: Unit scst.service not loaded.
[2020-10-09 07:20:25] + true
[2020-10-09 07:20:25] + update-rc.d -f scst remove
[2020-10-09 07:20:25] + systemctl disable scst
[2020-10-09 07:20:25] Failed to disable unit: No such file or directory
[2020-10-09 07:20:25] ++ _exit
[2020-10-09 07:20:25] ++ local exit_status=1
[2020-10-09 07:20:25] ++ set +e
[2020-10-09 07:20:25] ++ '[' 1 -ne 0 ']'
[2020-10-09 07:20:25] ++ echo 'Deploy Upgrade Failed'
[2020-10-09 07:20:25] Deploy Upgrade Failed

• Recovery of deploy from backup also fails as backup is corrupt or backup password unknown or deploy backup is unavailable:

(ONTAPdeploy) deploy backup restore -path /home/admin/ -filename deploy_backup_20201013074541.tar.gz -foreground
Enter password to decrypt backup file:
[Request 13 (failure)]: Job failed with error. <SDOTAdminError(key="ConfigurationRestoreErr", message="Configuration restore failed. Reason: Configuration backup file has invalid contents. Verify the password given is correct.")>
(ONTAPdeploy)