Proxmox: Shrinking disk of an LVM backed container

LVM, or Logical Volume Management, is a storage device management technology that gives users the power to pool and abstract the physical layout of component storage devices for easier and flexible administration. Utilizing the device mapper Linux kernel framework, the current iteration, LVM2, can be used to gather existing storage devices into groups and allocate logical units from the combined space as needed.
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Proxmox VE 5.4 software RAID using MDADM

Proxmox Virtual Environment is an open source server virtualization management solution based on QEMU/KVM and LXC. You can manage virtual machines, containers, highly available clusters, storage and networks with an integrated, easy-to-use web interface or via CLI. Proxmox VE code is licensed under the GNU Affero General Public License, version 3. The project is developed and maintained by Proxmox Server Solutions GmbH.

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Proxmox VE 5.4 fix updates / upgrades

Proxmox VE 5.4 has been released, this version is based on Debian 9. (Linux Kernel 4.15) It includes allot of new features, but sadly updates are still pointing to the enterprise repository for updates. This results in ugly error message when trying

apt-get update

such as:

root@server2:~# apt-get update
Hit:1 http://security.debian.org stretch/updates InRelease
Ign:2 http://ftp.debian.org/debian stretch InRelease     
Hit:3 http://ftp.debian.org/debian stretch-updates InRelease
Hit:4 http://ftp.debian.org/debian stretch Release 
Ign:5 https://enterprise.proxmox.com/debian/pve stretch InRelease
Ign:6 https://enterprise.proxmox.com/debian/pve stretch Release
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Ign:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Err:7 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise amd64 Packages
  401  Unauthorized
Ign:8 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise all Packages
Ign:10 https://enterprise.proxmox.com/debian/pve stretch/pve-enterprise Translation-en
Reading package lists... Done
W: The repository 'https://enterprise.proxmox.com/debian/pve stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch https://enterprise.proxmox.com/debian/pve/dists/stretch/pve-enterprise/binary-amd64/Packages  401  Unauthorized
E: Some index files failed to download. They have been ignored, or old ones used instead.

To fix this, its similar to V3.X and V4.X. We need to add one repository:

nano /etc/apt/sources.list

add:

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

Then disable or remove

rm -f /etc/apt/sources.list.d/pve-enterprise.list

(for disable add a # in front of the first line starting with deb)

Now you can run those updates take note only

apt-get update

and

apt-get dist-upgrade

are supported by Proxmox!