Comment 6 for bug 1625611

I try to update the Mirantis OpenStack environment from 9.0 to 9.1.

Procedure：7
https://docs.mirantis.com/openstack/fuel/fuel-9.1/release-notes/update-product.html

It has caused the following problems.
Is this would be similar events?

This environment was using 'Neutron VMware DVS ML2 plugin' plugin.

```
[root@fuel ~]# fuel env
id | status | name | release_id
---+-------------+------+-----------
1 | operational | DVS | 2
[root@fuel ~]#
[root@fuel ~]# update-prepare prepare env 1
Warning: Permanently added '192.168.114.103' (ECDSA) to the list of known hosts.
W: GPG error: http://mirror.fuel-infra.org mos9.0-holdback Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
W: GPG error: http://mirror.fuel-infra.org mos9.0-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
W: GPG error: http://mirror.fuel-infra.org mos9.0-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
Reading package lists...
Building dependency tree...
Reading state information...
nailgun-agent is already the newest version.
nailgun-mcagents is already the newest version.
The following packages were automatically installed and are no longer required:
  cloud-guest-utils eatmydata python-cheetah python-oauth python-serial
  python3-pycurl python3-software-properties software-properties-common
  unattended-upgrades
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 53 not upgraded.
Warning: Permanently added '192.168.114.104' (ECDSA) to the list of known hosts.
W: GPG error: http://mirror.fuel-infra.org mos9.0-holdback Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
W: GPG error: http://mirror.fuel-infra.org mos9.0-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
W: GPG error: http://mirror.fuel-infra.org mos9.0-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
Reading package lists...
Building dependency tree...
Reading state information...
nailgun-agent is already the newest version.
nailgun-mcagents is already the newest version.
The following packages were automatically installed and are no longer required:
  cloud-guest-utils eatmydata python-cheetah python-oauth python-serial
  python3-pycurl python3-software-properties software-properties-common
  unattended-upgrades
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 52 not upgraded.
Warning: Permanently added '192.168.114.102' (ECDSA) to the list of known hosts.
W: GPG error: http://mirror.fuel-infra.org mos9.0-holdback Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
W: GPG error: http://mirror.fuel-infra.org mos9.0-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
W: GPG error: http://mirror.fuel-infra.org mos9.0-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BCE5CC461FA22B08
Reading package lists...
Building dependency tree...
Reading state information...
nailgun-agent is already the newest version.
nailgun-mcagents is already the newest version.
The following packages were automatically installed and are no longer required:
  cloud-guest-utils eatmydata python-cheetah python-oauth python-serial
  python3-pycurl python3-software-properties software-properties-common
  unattended-upgrades
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 52 not upgraded.
[root@fuel ~]#
```

message "52 not upgraded".
I think this didn't update packages.