sur mon proxmox : apt update 
```bash
Hit:1 http://security.debian.org bookworm-security InRelease 
Hit:2 http://ftp.fr.debian.org/debian bookworm InRelease Hit:3 http://ftp.fr.debian.org/debian bookworm-updates InRelease 
Err:4 https://enterprise.proxmox.com/debian/ceph-quincy bookworm InRelease 401 Unauthorized [IP: 51.91.38.34 443] 
Err:5 https://enterprise.proxmox.com/debian/pve bookworm InRelease 401 Unauthorized [IP: 51.91.38.34 443] Reading package lists... Done E: Failed to fetch https://enterprise.proxmox.com/debian/ceph-quincy/dists/bookworm/InRelease 401 Unauthorized [IP: 51.91.38.34 443] 
E: The repository 'https://enterprise.proxmox.com/debian/ceph-quincy bookworm InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. 
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/bookworm/InRelease 401 Unauthorized [IP: 51.91.38.34 443] 
E: The repository 'https://enterprise.proxmox.com/debian/pve bookworm InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. 
N: See apt-secure(8) manpage for repository creation and user configuration details.
```

## Désactiver le dépôt Enterprise Proxmox

Édite le fichier :

```bash
nano /etc/apt/sources.list.d/pve-enterprise.list
```

Tu vas voir une ligne comme :

```
deb https://enterprise.proxmox.com/debian/pve bookworm pve-enterprise
```

**Commente-la** en ajoutant un `#` devant :

```
# deb https://enterprise.proxmox.com/debian/pve bookworm pve-enterprise
```

Enregistre :  
`CTRL + O`, puis `ENTER`, puis `CTRL + X`

---
## Désactiver le dépôt Enterprise Ceph (si présent)

Édite :

```bash
nano /etc/apt/sources.list.d/ceph.list
```

Commente la ligne :

```
# deb https://enterprise.proxmox.com/debian/ceph-quincy bookworm enterprise
```

---
## Ajouter le dépôt gratuit Proxmox (No‑Subscription)

Édite le fichier :

```bash
nano /etc/apt/sources.list
```

Ajoute cette ligne **si elle n’existe pas** :

```
deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription
```

---
## Ajouter le dépôt Ceph gratuit (si tu utilises Ceph)

Toujours dans `/etc/apt/sources.list` :

```
deb http://download.proxmox.com/debian/ceph-quincy bookworm no-subscription
```

---
## Mettre à jour

```bash
apt update
```