Install Google Cloud components error from gcloud command

I am trying to install several GCP components from the gcloud command-line tool and always get the same error:

$ gcloud components list

Your current Cloud SDK version is: 146.0.0
The latest available version is: 146.0.0

┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│                                                  Components                                                 │
├───────────────┬──────────────────────────────────────────────────────┬──────────────────────────┬───────────┤
│     Status    │                         Name                         │            ID            │    Size   │
├───────────────┼──────────────────────────────────────────────────────┼──────────────────────────┼───────────┤
│ Not Installed │ App Engine Go Extensions                             │ app-engine-go            │  47.9 MiB │
│ Not Installed │ Bigtable Command Line Tool                           │ cbt                      │   3.8 MiB │
│ Not Installed │ Cloud Datalab Command Line Tool                      │ datalab                  │   < 1 MiB │
│ Not Installed │ Cloud Datastore Emulator                             │ cloud-datastore-emulator │  15.4 MiB │
│ Not Installed │ Cloud Datastore Emulator (Legacy)                    │ gcd-emulator             │  38.1 MiB │
│ Not Installed │ Cloud Pub/Sub Emulator                               │ pubsub-emulator          │  21.0 MiB │
│ Not Installed │ Google Container Registry's Docker credential helper │ docker-credential-gcr    │   3.3 MiB │
│ Not Installed │ gcloud app Java Extensions                           │ app-engine-java          │ 128.3 MiB │
│ Not Installed │ gcloud app Python Extensions                         │ app-engine-python        │   7.2 MiB │
│ Not Installed │ kubectl                                              │ kubectl                  │  11.5 MiB │
│ Installed     │ BigQuery Command Line Tool                           │ bq                       │   < 1 MiB │
│ Installed     │ Cloud SDK Core Libraries                             │ core                     │   5.7 MiB │
│ Installed     │ Cloud Storage Command Line Tool                      │ gsutil                   │   2.8 MiB │
│ Installed     │ Default set of gcloud commands                       │ gcloud                   │           │
│ Installed     │ gcloud Alpha Commands                                │ alpha                    │   < 1 MiB │
│ Installed     │ gcloud Beta Commands                                 │ beta                     │   < 1 MiB │
└───────────────┴──────────────────────────────────────────────────────┴──────────────────────────┴───────────┘

Then attempting to install kubectl

$ gcloud components install kubectl

You cannot perform this action because this Cloud SDK installation is 
managed by an external package manager.  If you would like to get the 
latest version, please see our main download page at:
https://cloud.google.com/sdk/
ERROR: (gcloud.components.install) The component manager is disabled for this installation

Any idea why is this error raised?

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