a question about upgrade Proxmox 5.4 to 6.0

[fxqq]

i want to update the system, i run "apt update" and "apt dist-upgrade", but there have some mistake , i try to reboot but it still have the error,what can i do?

root@Ryan:~# apt update
Hit:1 http://mirrors.ustc.edu.cn/proxmox/debian/ceph-luminous stretch InRelease
Hit:2 http://mirrors.ustc.edu.cn/proxmox/debian buster InRelease
Hit:3 http://mirrors.ustc.edu.cn/proxmox/debian/pve stretch InRelease
Ign:4 https://mirrors.ustc.edu.cn/debian stretch InRelease
Hit:5 https://mirrors.ustc.edu.cn/debian stretch-updates InRelease
Hit:6 https://mirrors.ustc.edu.cn/debian stretch-backports InRelease
Hit:7 https://mirrors.ustc.edu.cn/debian-security stretch/updates InRelease
Hit:8 https://mirrors.ustc.edu.cn/debian stretch Release
Hit:10 http://download.proxmox.com/debian/ceph-luminous stretch InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
129 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/ceph.list:2 and /etc/apt/sources.list.d/ceph.list:3
root@Ryan:~# apt dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Error!
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libpve-common-perl : Breaks: pve-container (< 3.0-9) but 2.0-40 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

 

[apoc]

I think I have hit a similar issue (not sure though it was the same).
I had updated my /etc/apt/sources.list to the new "buster" release, but have not had taken care on the Proxmox side of things.
Check /etc/apt/sources.list.d/pve-install-repo.list and if you have switched to "buster" there as well.
It should look like this:

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