Upgrade vcsa 6.0 to 6.5 failed : There is no MA extension for VUM available on source VC

Hello,

I am using the linux GUI vcsa installer and try to migrate from vcsa 6.0 to vcsa 6.5 and I get this failed message :

-> error: There is no MA extension for VUM available on source VC.

I've checked that vum is regitered to the source vcsa and I guess there is something missing somewhere (vum service migration ... ??) to complete this migration.

Thanks for your help.