So I downgraded all 15 versions to 12 versions:
librados2
librbd1
ceph-common
when I do
root@nb-pve1:~#
apt update && apt --fix-broken install
Hit:1
http://security.debian.org/debian-security buster/updates InRelease
Hit:2
http://ftp.nl.debian.org/debian buster InRelease
Hit:3
http://download.proxmox.com/debian/pve buster InRelease
Hit:4
http://download.proxmox.com/debian/corosync-3 stretch InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
449 packages can be upgraded. Run 'apt list --upgradable' to see them.
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... failed.
The following packages have unmet dependencies:
ceph-common : Depends: python-cephfs (= 12.2.11+dfsg1-2.1+b1) but it is not installed
Depends: python-rados (= 12.2.11+dfsg1-2.1+b1) but it is not installed
Depends: python-rbd (= 12.2.11+dfsg1-2.1+b1) but 12.2.13-pve1~bpo9 is installed
Depends: libboost-program-options1.67.0 but it is not installed
Depends: libboost-regex1.67.0 (>= 1.67.0-10) but it is not installed
Depends: libboost-thread1.67.0 but it is not installed
dirmngr : Depends: gpgconf (= 2.2.12-1+deb10u2) but it is not installed
dmsetup : Depends: libdevmapper1.02.1 (>= 2:1.02.138) but 2:1.02.137-pve6 is installed
gnupg : Depends: gnupg-utils (< 2.2.12-1+deb10u2.1~) but it is not installed
Depends: gnupg-utils (>= 2.2.12-1+deb10u2) but it is not installed
Depends: gpg (< 2.2.12-1+deb10u2.1~) but it is not installed
Depends: gpg (>= 2.2.12-1+deb10u2) but it is not installed
Depends: gpg-agent (< 2.2.12-1+deb10u2.1~)
Depends: gpg-agent (>= 2.2.12-1+deb10u2)
Depends: gpg-wks-client (< 2.2.12-1+deb10u2.1~) but it is not installed
Depends: gpg-wks-client (>= 2.2.12-1+deb10u2) but it is not installed
Depends: gpg-wks-server (< 2.2.12-1+deb10u2.1~) but it is not installed
Depends: gpg-wks-server (>= 2.2.12-1+deb10u2) but it is not installed
Depends: gpgsm (< 2.2.12-1+deb10u2.1~) but it is not installed
Depends: gpgsm (>= 2.2.12-1+deb10u2) but it is not installed
Depends: gpgv (>= 2.2.12-1+deb10u2) but 2.1.18-8~deb9u4 is installed
libapparmor-perl : Depends: perl-base (>= 5.28.1-5) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.1
libauthen-pam-perl : Depends: perl (>= 5.28.0-3) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.0
libcrypt-ssleay-perl : Depends: perl (>= 5.28.0-3) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.0
libgail-common : Depends: libgtk2.0-0 (>= 2.24.32) but 2.24.31-2 is installed
libgail18 : Depends: libgtk2.0-0 (= 2.24.32-3) but 2.24.31-2 is installed
libpve-u2f-server-perl : Depends: perl (>= 5.28.1-6) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.1
libpython2.7 : Depends: libpython2.7-stdlib (= 2.7.16-2+deb10u1) but 2.7.13-2+deb9u6 is installed
librados2 : Depends: libboost-regex1.67.0 (>= 1.67.0-10) but it is not installed
Depends: libboost-thread1.67.0 but it is not installed
librados2-perl : Depends: perl (>= 5.28.1-6) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.1
libradosstriper1 : Depends: librados2 (= 15.2.17-pve1~bpo10) but 12.2.11+dfsg1-2.1+b1 is installed
librbd-dev : Depends: librados-dev but it is not installed
librgw2 : Depends: librados2 (= 15.2.17-pve1~bpo10) but 12.2.11+dfsg1-2.1+b1 is installed
Depends: libcurl4 (>= 7.28.0) but it is not installed
libterm-readline-gnu-perl : Depends: perl (>= 5.28.1-3) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.1
libtext-charwidth-perl : Depends: perl-base (>= 5.28.0-3) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.0
libxml-libxml-perl : Depends: perl (>= 5.28.1-4) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.1
python-rbd : Depends: librbd1 (>= 12.2.13-pve1~bpo9) but 12.2.11+dfsg1-2.1+b1 is installed
python-rgw : Depends: python-rados (= 12.2.13-pve1~bpo9) but it is not installed
python2.7 : Depends: python2.7-minimal (= 2.7.16-2+deb10u1) but 2.7.13-2+deb9u6 is installed
Depends: libpython2.7-stdlib (= 2.7.16-2+deb10u1) but 2.7.13-2+deb9u6 is installed
python3-cephfs : Depends: python3-ceph-argparse (= 15.2.17-pve1~bpo10) but it is not installable
python3-rbd : Depends: librbd1 (>= 15.2.17-pve1~bpo10) but 12.2.11+dfsg1-2.1+b1 is installed
texinfo : Depends: perl (>= 5.28.0-3) but 5.24.1-3+deb9u7 is installed
Depends: perlapi-5.28.0
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies